Improve widget retranslation

Signed-off-by: Loren Eteval <loren.eteval@proton.me>

Furious/Actions/Import.py

@@ -304,8 +304,8 @@ class ImportURIsProgressDialog(AppQTransientDialog):
 
     def retranslate(self):
         """Refresh translated text for the import ur is progress dialog."""
-        self.setWindowTitle(_(self.windowTitle()))
-        self.cancelButton.setText(_(self.cancelButton.text()))
+        super().retranslate()
+
         self.updateStatus()
 
 
@@ -316,14 +316,10 @@ class MBoxImportError(AppQMessageBox):
         """Initialize the MBoxImportError."""
         super().__init__(*args, **kwargs)
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box import error."""
         self.setText(_(self.text()))
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 class MBoxImportMultiSuccess(AppQMessageBox):
     """Represent m box import multi success."""
@@ -358,14 +354,10 @@ class MBoxImportMultiSuccess(AppQMessageBox):
             # Limited
             return _('Import share link success') + f'\n\n...'
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box import multi success."""
         self.setText(self.customText())
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 class MBoxImportSuccess(AppQMessageBox):
     """Represent m box import success."""
@@ -383,14 +375,10 @@ class MBoxImportSuccess(AppQMessageBox):
         else:
             return _('Import success')
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box import success."""
         self.setText(self.customText())
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 class ImportFromFileAction(AppQAction):
     """Handle the import from file action."""

Furious/Backends/Xray/AssetListView.py

@@ -49,14 +49,10 @@ class MBoxAssetExists(AppQMessageBox):
             AppQMessageBox.StandardButton.Yes | AppQMessageBox.StandardButton.No
         )
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box asset exists."""
         self.setText(_(self.text()))
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 class XrayAssetListView(Mixins.ThemeAware, AppQListView):
     """Provide the model-based Xray asset viewer list."""

Furious/Qt/AGENTS.md

@@ -15,6 +15,14 @@ behavior, and lifetime primitives; pages and services consume them without creat
   object-name rule even when the widget's enabled state is correct.
 - Controls that retranslate retain source text; semantic/user-defined values stay untranslated. Preserve keyboard focus,
   shortcut scope, accessibility, translated-text growth, responsive layout, high-DPI behavior, and both themes.
+  Extend a concrete base retranslator when its standard fields still apply; retain intentional state/content
+  overrides instead of calling the abstract mixin. Registered child controls translate themselves, including their
+  opt-out flags; owners translate plain Qt controls that have no registration. Message boxes customize
+  `_retranslateContent()` for composite text or preserved diagnostics, leaving title, heading, buttons and geometry
+  with the shared retranslator. The locale-switch cases in `tests/test_ui_behavior.py` cover both button policies
+  and diagnostic preservation; progress and metrics cases cover one child refresh per global pass.
+  Visible message boxes refit after registered children finish translating, through a weak continuation that
+  ignores hidden or destroyed dialogs. Preserve their bounded button widths and transient destruction policy.
 - Application-owned theme transitions commit destination state immediately; snapshots are non-interactive presentation
   objects that are interrupted/disposed on replacement, geometry change, window destruction, or application cleanup.
   Geometry/destruction event filters retire snapshots immediately but defer completion observers through an owned

Furious/Qt/QtGui.py

@@ -304,12 +304,18 @@ class AppQAction(Mixins.QTranslatable, Mixins.ThemeAware, QAction):
 
         def recursiveTranslate(action, memo):
             """Handle recursive translate for the app q action."""
-            if action not in memo and not action.isSeparator() and action.translatable:
-                action.setText(_(action.text()))
-                action.setStatusTip(_(action.statusTip()))
+            if action in memo:
+                return
 
             memo[action] = True
 
+            if action is not self and isinstance(action, Mixins.QTranslatable):
+                return
+
+            if not action.isSeparator() and getattr(action, 'translatable', True):
+                action.setText(_(action.text()))
+                action.setStatusTip(_(action.statusTip()))
+
             # Some old version PySide6 does not have menu() method
             # for QAction. Protect it
             if hasattr(action, 'menu'):

Furious/Qt/QtWidgets.py

@@ -522,7 +522,9 @@ class AppQDialogButtonBox(Mixins.QTranslatable, QDialogButtonBox):
     def retranslate(self):
         """Refresh translated text for the app Qt dialog button box."""
         for button in self.buttons():
-            button.setText(_(button.text()))
+            if not isinstance(button, Mixins.QTranslatable):
+                # Manage the translation explicitly
+                button.setText(_(button.text()))
 
 
 class AppQGroupBox(Mixins.QTranslatable, QGroupBox):
@@ -1995,7 +1997,7 @@ class AppQMessageBox(AppQTransientDialog):
 
     def retranslate(self):
         """Refresh translated text for the app q message box."""
-        self.setWindowTitle(_(self.windowTitle()))
+        super().retranslate()
 
         try:
             self.setHeading(_(self.heading()))
@@ -2003,6 +2005,32 @@ class AppQMessageBox(AppQTransientDialog):
             # Runtime headings may already be localized by their owning layer.
             pass
 
+        self._retranslateContent()
+
+        for button in self.buttons():
+            if isinstance(button, Mixins.QTranslatable):
+                continue
+
+            if button.text().find('OK') != -1:
+                # &OK...
+                pass
+            else:
+                button.setText(_(button.text()))
+
+        if self.isVisible():
+            # Registered child buttons finish translating later in the global pass.
+            singleShotWeakly(0, self, '_refreshTranslatedGeometry')
+        else:
+            self.moveToCenter()
+
+    def _refreshTranslatedGeometry(self):
+        """Fit current translated controls after the registered children update."""
+        if self.isVisible():
+            self._updateDialogSize()
+            self.moveToCenter()
+
+    def _retranslateContent(self):
+        """Translate ordinary content; subclasses own composite or diagnostic text."""
         self.setText(_(self.text()))
 
         try:
@@ -2011,15 +2039,6 @@ class AppQMessageBox(AppQTransientDialog):
             # Any translatable informative text
             pass
 
-        for button in self.buttons():
-            if button.text().find('OK') != -1:
-                # &OK...
-                pass
-            else:
-                button.setText(_(button.text()))
-
-        self.moveToCenter()
-
     def disconnectedCallback(self):
         """Update the app q message box for a disconnected state."""
         self.setWindowIcon(AppHue.disconnectedWindowIcon())
@@ -2466,14 +2485,10 @@ class MBoxQuestionDelete(AppQMessageBox):
         else:
             return _('Delete this item?') + f'\n\n{self.possibleRemark}'
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box question delete."""
         self.setText(self.customText())
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 class MBoxNewChangesNextTime(AppQMessageBox):
     """Represent m box new changes next time."""
@@ -2496,15 +2511,10 @@ class MBoxNewChangesNextTime(AppQMessageBox):
             _('New changes will take effect next time') + '\n\n' + _('Reconnect now?')
         )
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box new changes next time."""
-        self.setWindowTitle(_(self.windowTitle()))
         self.setText(self.customText())
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 def showMBoxNewChangesNextTime(**kwargs):
     """Show m box new changes next time."""
@@ -2565,15 +2575,10 @@ class MBoxDirectRulesNotAllowed(AppQMessageBox):
             + _('Switch to global and reconnect?')
         )
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box direct rules not allowed."""
-        self.setHeading(_(self.heading()))
         self.setText(self.customText())
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 def showMBoxDirectRulesNotAllowed(**kwargs):
     """Show m box direct rules not allowed."""

Furious/Service/UpdateManager.py

@@ -54,16 +54,11 @@ class MBoxQuestionUpdate(AppQMessageBox):
         """Return the user-facing message text for the m box question update."""
         return _('New version available') + f': {self.version}'
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box question update."""
         self.setText(self.customText())
-        self.setWindowTitle(_(self.windowTitle()))
         self.setInformativeText(_(self.informativeText()))
 
-        # Ignore button text
-
-        self.moveToCenter()
-
 
 class UpdateManager(HttpGetManager):
     """Coordinate updates operations."""

Furious/Widget/ServerTableView.py

@@ -122,16 +122,11 @@ class MBoxUpdateSubsInfo(AppQMessageBox):
                 * self.fontMetrics().averageCharWidth(),
             )
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box update subs info."""
-        self.setWindowTitle(_(self.windowTitle()))
         self.setText(self.customText())
         self.setColumnMinWidth()
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 class DeleteServersProgressDialog(AppQTransientDialog):
     """Present progress and cancellation controls for delete servers."""
@@ -279,8 +274,8 @@ class DeleteServersProgressDialog(AppQTransientDialog):
 
     def retranslate(self):
         """Refresh translated text for the delete servers progress dialog."""
-        self.setWindowTitle(_(self.windowTitle()))
-        self.cancelButton.setText(_(self.cancelButton.text()))
+        super().retranslate()
+
         self.updateStatus()
 
 
@@ -320,6 +315,7 @@ class DuplicateServersProgressDialog(AppQTransientDialog):
 
     def open(self):
         result = super().open()
+
         singleShotWeakly(0, self, 'duplicateNext')
 
         return result
@@ -1501,6 +1497,7 @@ class ServerTableView(
             for row, profile in enumerate(Storage.UserServers())
             if profile.metadata.profileId in changed
         ]
+
         self.sourceModel.dataChanged.emit(
             self.sourceModel.index(rows[0], 0),
             self.sourceModel.index(rows[-1], self.sourceModel.columnCount() - 1),

Furious/Window/LogPage.py

@@ -131,14 +131,10 @@ class MBoxSaveError(AppQMessageBox):
         else:
             return _('Unable to save log')
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box save error."""
         self.setText(self.customText())
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 def saveAsFile(content: str):
     """Save as file."""

Furious/Window/MetricsPage.py

@@ -458,7 +458,5 @@ class MetricsPage(Mixins.QTranslatable, Mixins.ThemeAware, QMainWindow):
             _('Upload Speed'),
             _('Upload Traffic Usage'),
         )
-        self.endpointInfoWidget.retranslate()
-
         self._dirty = True
         self._scheduleRender()

Furious/Window/TextEditorWindow.py

@@ -72,14 +72,10 @@ class MBoxJSONDecodeError(AppQMessageBox):
             + f'\n\n{self.error}'
         )
 
-    def retranslate(self):
+    def _retranslateContent(self):
         """Refresh translated text for the m box JSON decode error."""
         self.setText(self.customText())
 
-        # Ignore informative text, buttons
-
-        self.moveToCenter()
-
 
 class TextEditorWindow(AppQMainWindow):
     """Present the text editor window."""

tests/README.md

@@ -102,7 +102,7 @@ worker. Choose tests by the changed contract rather than by filename alone.
 | [test_service_runtime.py](test_service_runtime.py) | Update-response validation, HTTP timeouts/context release/reentrant destruction, duplicate completion, plugin-page registration, bounded connectivity requests, blocked statistics-worker callback lifetime. |
 | [test_xray_asset_download.py](test_xray_asset_download.py) | Checksum validation, atomic asset replacement, real pool delivery, early owner destruction, callback release, plugin shutdown. |
 | [test_endpoint_info.py](test_endpoint_info.py) | Opt-in proxy-only discovery using fake HTTP responses, fallback/cache/session invalidation, privacy/presentation controls, local map styling and persistent-scene contracts. |
-| [test_metrics_behavior.py](test_metrics_behavior.py) | Immutable time-series history, pruning/buckets, usage versus speed clearing, hidden-page rendering, graph hover lookup. |
+| [test_metrics_behavior.py](test_metrics_behavior.py) | Immutable time-series history, pruning/buckets, usage versus speed clearing, hidden-page rendering, graph hover lookup, and independent endpoint retranslation without changing history. |
 | [test_log_manager_generation.py](test_log_manager_generation.py) | Reference-model state transitions, concurrency, live/retired ownership, bounded FIFO cleanup, structural complexity, incremental/multiline LogPage rendering; also contains an opt-in generation campaign. |
 | [test_log_manager_benchmark.py](test_log_manager_benchmark.py) | Data-only report validation, workload compatibility, timing ratios, and real standalone CLI JSON round trips; no performance gates or historical imports. |
 
@@ -114,7 +114,7 @@ worker. Choose tests by the changed contract rather than by filename alone.
 | [test_main_window_geometry.py](test_main_window_geometry.py) | First-show lifecycle, restored/default/legacy geometry, main/routing window reuse, session-only navigation state, protection of never-shown windows' saved geometry. |
 | [test_dialog_geometry.py](test_dialog_geometry.py) | Dialog show/open/exec preparation, sizing/centering, failure cleanup, specialized message-box geometry and transient destruction. |
 | [test_layout_matrix.py](test_layout_matrix.py) | Navigation and message-box layouts in fresh processes at scale factors 1, 1.25, 1.5, and 2, under both themes. |
-| [test_ui_behavior.py](test_ui_behavior.py) | Translation and editor mappings, settings construction visibility/organization/search/platform gates, stable server/routing moves, real QR rendering/decoding, incremental log filtering/tail behavior, connected-routing change notices, message boxes and connection-error copy/log navigation, shared Home/tray state. |
+| [test_ui_behavior.py](test_ui_behavior.py) | Translation and editor mappings, settings construction visibility/organization/search/platform gates, stable server/routing moves, real QR rendering/decoding, incremental log filtering/tail behavior, connected-routing change notices, message boxes and connection-error copy/log navigation, shared Home/tray state, preserved message payloads and managed-versus-plain button retranslation. |
 | [test_qt_interactions.py](test_qt_interactions.py) | Real keyboard/mouse/focus and proxy mapping, scoped shortcuts, sorting/selection, stable subscription deletion confirmations, debounced Home search, favorite actions and intersecting filters, Tests-menu selection color, shared settings, batched import/delete/duplication, cancellation, preparation failure, and owner destruction. |
 | [test_qr_export_scalability.py](test_qr_export_scalability.py) | Production capture cap, immediate single export, incremental yielding, failure/cancel/close paths, immutable snapshots, window-owned state destruction. |
 | [test_stylesheet_states.py](test_stylesheet_states.py) | Targeted rendering/alpha/geometry assertions for table/list insets, popup corners, clear buttons, focus/disabled states, and stylesheet composition. |

tests/test_metrics_behavior.py

@@ -19,6 +19,7 @@
 
 from __future__ import annotations
 
+from Furious.Frozenlib import AppSettings, Mixins
 from Furious.Qt import gettext as _
 from Furious.Service.MetricsHistory import (
     DOWNLOAD_SPEED_METRIC,
@@ -33,7 +34,15 @@ from Furious.Window.MetricsPage import MetricsPage
 
 from PySide6 import QtCore
 
-from tests.support import application, collectAtBoundary, processQtEvents, waitFor
+from tests.support import (
+    application,
+    collectAtBoundary,
+    isolatedSettings,
+    processQtEvents,
+    waitFor,
+)
+
+from unittest import mock
 
 import math
 import time
@@ -190,6 +199,39 @@ class MetricsPageAndGraphTest(unittest.TestCase):
         """Drain deferred widget destruction after every UI case."""
         collectAtBoundary()
 
+    def testGlobalRetranslationRefreshesEndpointOnceWithoutChangingHistory(self):
+        with isolatedSettings():
+            AppSettings.set('Language', 'EN')
+            manager = MetricsHistory()
+            page = MetricsPage(manager)
+            manager.recordSample({DOWNLOAD_SPEED_METRIC: 32})
+            samples = manager.rawSamples()
+
+            try:
+                for locale in ('RU', 'ZH', 'EN'):
+                    AppSettings.set('Language', locale)
+                    with mock.patch.object(
+                        page.endpointInfoWidget,
+                        'retranslate',
+                        wraps=page.endpointInfoWidget.retranslate,
+                    ) as translate:
+                        Mixins.QTranslatable.retranslateAll()
+                        self.assertEqual(translate.call_count, 1)
+                    self.assertEqual(
+                        page.metricsCard.downloadTitleLabel.text(), _('Download')
+                    )
+                    self.assertEqual(
+                        page.endpointInfoWidget.titleLabel.text(),
+                        _('Proxy Endpoint Information'),
+                    )
+                    self.assertEqual(manager.rawSamples(), samples)
+                    self.assertEqual(page._renderRevision, 0)
+            finally:
+                page.close()
+                page.deleteLater()
+                manager.deleteLater()
+                processQtEvents()
+
     def testTrafficGraphsAndSelectorsShareOneCard(self):
         """Keep the page title separate while grouping all metrics controls."""
         manager = MetricsHistory()

tests/test_qt_interactions.py

@@ -2343,6 +2343,59 @@ class ProfileMutationBatchTest(unittest.TestCase):
             self.assertFalse(isValid(dialog))
             self.assertEqual(len(Storage.UserServers()), 1000)
 
+    def testProgressDialogsUseSharedRetranslationWithoutLosingProgress(self):
+        with self.table(10) as (table, controller):
+            AppSettings.set('Language', 'EN')
+            dialogs = (
+                (
+                    ImportURIsProgressDialog(('fixture',) * 10, parent=table),
+                    'Import',
+                    'Importing',
+                    'currentIndex',
+                ),
+                (
+                    DeleteServersProgressDialog(table, range(10), parent=table),
+                    'Delete',
+                    'Deleting',
+                    'deletedCount',
+                ),
+                (
+                    DuplicateServersProgressDialog(table, table._visibleProfileIds()),
+                    'Duplicate',
+                    'Duplicating',
+                    'copiedCount',
+                ),
+            )
+
+            for dialog, title, status, counter in dialogs:
+                setattr(dialog, counter, 7)
+
+            for locale in ('RU', 'ZH', 'EN'):
+                AppSettings.set('Language', locale)
+                with ExitStack() as stack:
+                    translations = [
+                        stack.enter_context(
+                            mock.patch.object(
+                                dialog.cancelButton,
+                                'retranslate',
+                                wraps=dialog.cancelButton.retranslate,
+                            )
+                        )
+                        for dialog, *_fields in dialogs
+                    ]
+                    Mixins.QTranslatable.retranslateAll()
+
+                for (dialog, title, status, counter), translated in zip(
+                    dialogs, translations
+                ):
+                    self.assertEqual(translated.call_count, 1)
+                    self.assertEqual(dialog.windowTitle(), gettext(title))
+                    self.assertEqual(dialog.cancelButton.text(), gettext('Cancel'))
+                    self.assertEqual(
+                        dialog.statusLabel.text(), gettext(status) + '... 7/10'
+                    )
+                    self.assertEqual(getattr(dialog, counter), 7)
+
     def testImportCoalescesRowsAndProgressWithoutLosingInvalidInputPositions(self):
         profiles = [self.profile(str(index)) for index in range(600)]
         invalid = mock.Mock()

tests/test_ui_behavior.py

@@ -66,6 +66,7 @@ from Furious.Backends.Xray.VmessEditor import (
     VmessEditor,
 )
 from Furious.Actions.Connection import ConnectAction, ConnectionErrorMessageBox
+from Furious.Actions.Import import MBoxImportError
 from Furious.Controllers.ConnectionController import (
     ConnectionError,
     ConnectionController,
@@ -99,9 +100,13 @@ from Furious.Repository import Storage
 from Furious.Repository.Routings import UserRoutings
 from Furious.Qt import (
     AppHue,
+    AppQAction,
     AppQComboBox,
     AppQDialog,
+    AppQDialogButtonBox,
     AppQMessageBox,
+    AppQMenu,
+    AppQPushButton,
     AppQSwitch,
     AppStyleSheet,
     gettext as _,
@@ -130,9 +135,10 @@ from Furious.Widget.RoutingSelector import RoutingSelector
 from Furious.Widget.ServerTableView import ServerTableView
 
 from PySide6 import QtCore
-from PySide6.QtGui import QImage
+from PySide6.QtGui import QAction, QImage
 from PySide6.QtTest import QAbstractItemModelTester, QSignalSpy, QTest
 from PySide6.QtWidgets import (
+    QPushButton,
     QStackedWidget,
     QToolButton,
     QComboBox,
@@ -2972,6 +2978,119 @@ class DialogBehaviorTest(unittest.TestCase):
         """Finish every deferred transient deletion between tests."""
         collectAtBoundary()
 
+    def testCustomMessageRetranslationKeepsPayloadAndUpdatesDialogControls(self):
+        with isolatedSettings():
+            AppSettings.set('Language', 'EN')
+            box = MBoxImportError()
+            box.setWindowTitle(_('Duplicate'))
+            box.setHeading(_('Delete'))
+            box.setText(_('Invalid data'))
+            box.setInformativeText('Save')
+            button = box.addButton('Cancel', box.ButtonRole.RejectRole)
+
+            try:
+                for locale in ('RU', 'ZH', 'EN'):
+                    AppSettings.set('Language', locale)
+                    Mixins.QTranslatable.retranslateAll()
+                    self.assertEqual(box.windowTitle(), _('Duplicate'))
+                    self.assertEqual(box.heading(), _('Delete'))
+                    self.assertEqual(box.text(), _('Invalid data'))
+                    self.assertEqual(box.informativeText(), 'Save')
+                    self.assertEqual(button.text(), _('Cancel'))
+            finally:
+                box.deleteLater()
+                processQtEvents()
+
+    def testButtonContainersRespectManagedTranslationAndPlainQtFallback(self):
+        with isolatedSettings():
+            AppSettings.set('Language', 'EN')
+
+            for containerType in (AppQMessageBox, AppQDialogButtonBox):
+                with self.subTest(container=containerType.__name__):
+                    owner = containerType()
+                    protected = AppQPushButton('Cancel', translatable=False)
+                    managed = AppQPushButton('Save')
+                    plain = QPushButton('Cancel')
+
+                    for button in (protected, managed, plain):
+                        owner.addButton(button, owner.ButtonRole.ActionRole)
+
+                    try:
+                        for locale in ('RU', 'ZH', 'EN'):
+                            AppSettings.set('Language', locale)
+                            with mock.patch.object(
+                                managed, 'retranslate', wraps=managed.retranslate
+                            ) as translate:
+                                Mixins.QTranslatable.retranslateAll()
+                                self.assertEqual(translate.call_count, 1)
+                            self.assertEqual(protected.text(), 'Cancel')
+                            self.assertEqual(managed.text(), _('Save'))
+                            self.assertEqual(plain.text(), _('Cancel'))
+                    finally:
+                        owner.deleteLater()
+                        processQtEvents()
+
+    def testActionRetranslationLeavesManagedChildrenToTheirOwnPass(self):
+        with isolatedSettings():
+            AppSettings.set('Language', 'EN')
+            owner = QWidget()
+            menu = AppQMenu(parent=owner)
+            managed = AppQAction('Save', parent=menu)
+            protected = AppQAction('Cancel', parent=menu, translatable=False)
+            menu.addActions([managed, protected])
+            parent = AppQAction('Server', parent=owner, menu=menu)
+
+            try:
+                for locale in ('RU', 'ZH', 'EN'):
+                    AppSettings.set('Language', locale)
+                    with mock.patch.object(
+                        managed, 'setText', wraps=managed.setText
+                    ) as update:
+                        Mixins.QTranslatable.retranslateAll()
+                        self.assertEqual(update.call_count, 1)
+                    self.assertEqual(parent.text(), _('Server'))
+                    self.assertEqual(managed.text(), _('Save'))
+                    self.assertEqual(protected.text(), 'Cancel')
+
+                plain = QAction('Cancel', menu)
+                menu.addAction(plain)
+                AppSettings.set('Language', 'ZH')
+                Mixins.QTranslatable.retranslateAll()
+                self.assertEqual(plain.text(), _('Cancel'))
+            finally:
+                owner.deleteLater()
+                processQtEvents()
+
+    def testMessageGeometryRefreshesAfterManagedButtonTranslation(self):
+        with isolatedSettings():
+            AppSettings.set('Language', 'EN')
+            box = AppQMessageBox()
+            button = AppQPushButton(_('Copy Error'))
+            box.addButton(button, box.ButtonRole.ActionRole)
+            box.open()
+            processQtEvents()
+
+            try:
+                for locale in ('RU', 'ZH', 'EN'):
+                    AppSettings.set('Language', locale)
+                    Mixins.QTranslatable.retranslateAll()
+                    processQtEvents()
+                    self.assertEqual(button.text(), _('Copy Error'))
+                    self.assertGreaterEqual(
+                        button.width(), box._preferredButtonWidth(button)
+                    )
+                    self.assertEqual(box.surface.size(), box.size())
+
+                AppSettings.set('Language', 'RU')
+                Mixins.QTranslatable.retranslateAll()
+                deleteQObject(box)
+                processQtEvents()
+                self.assertFalse(isValid(box))
+            finally:
+                if isValid(box):
+                    box.close()
+                processQtEvents()
+
     def testThemeFallbackWorksBeforeConnectionControllerExists(self):
         """Allow startup error dialogs to use the disconnected theme safely."""
         with mock.patch(