5 files changed, 26 insertions, 11 deletions
diff --git a/src/plugins/styles/mac/qmacstyle_mac.mm b/src/plugins/styles/mac/qmacstyle_mac.mm
index 890dddbd1be..15dcea13bdf 100644
--- a/src/plugins/styles/mac/qmacstyle_mac.mm
+++ b/src/plugins/styles/mac/qmacstyle_mac.mm
@@ -3915,6 +3915,7 @@ void QMacStyle::drawControl(ControlElement ce, const QStyleOption *opt, QPainter
                     frameRect = frameRect.adjusted(-1, 0, 1, 0);
                 }
                 break;
+            case QStyleOptionTab::Moving: // Moving tab treated like End
             case QStyleOptionTab::End:
                 // Pressed state hack: tweak adjustments in preparation for flip below
                 if (isSelected || tabDirection == QMacStylePrivate::West)
diff --git a/src/widgets/styles/qcommonstyle.cpp b/src/widgets/styles/qcommonstyle.cpp
index 57365384430..08c22240925 100644
--- a/src/widgets/styles/qcommonstyle.cpp
+++ b/src/widgets/styles/qcommonstyle.cpp
@@ -2009,7 +2009,10 @@ void QCommonStyle::drawControl(ControlElement element, const QStyleOption *opt,
             }
             QRect iconRect;
             d->tabLayout(tab, widget, &tr, &iconRect);
-            tr = proxy()->subElementRect(SE_TabBarTabText, opt, widget); //we compute tr twice because the style may override subElementRect
+
+            // compute tr again, unless tab is moving, because the style may override subElementRect
+            if (tab->position != QStyleOptionTab::TabPosition::Moving)
+                tr = proxy()->subElementRect(SE_TabBarTabText, opt, widget);
 
             if (!tab->icon.isNull()) {
                 QPixmap tabIcon = tab->icon.pixmap(tab->iconSize, p->device()->devicePixelRatio(),
diff --git a/src/widgets/styles/qstyleoption.cpp b/src/widgets/styles/qstyleoption.cpp
index de7cd482a33..73164918bb1 100644
--- a/src/widgets/styles/qstyleoption.cpp
+++ b/src/widgets/styles/qstyleoption.cpp
@@ -1314,6 +1314,8 @@ QStyleOptionTab::QStyleOptionTab(int version)
     \value Middle The tab is neither the first nor the last tab in the tab bar.
     \value End The tab is the last tab in the tab bar.
     \value OnlyOneTab The tab is both the first and the last tab in the tab bar.
+    \value Moving The tab is moving by mouse drag or animation.
+           This enum value was added in Qt 6.6.
 
     \sa position
 */
diff --git a/src/widgets/styles/qstyleoption.h b/src/widgets/styles/qstyleoption.h
index 6841a81b84e..0e0118f6e9c 100644
--- a/src/widgets/styles/qstyleoption.h
+++ b/src/widgets/styles/qstyleoption.h
@@ -244,7 +244,7 @@ public:
     enum StyleOptionType { Type = SO_Tab };
     enum StyleOptionVersion { Version = 1 };
 
-    enum TabPosition { Beginning, Middle, End, OnlyOneTab };
+    enum TabPosition { Beginning, Middle, End, OnlyOneTab, Moving };
     enum SelectedPosition { NotAdjacent, NextIsSelected, PreviousIsSelected };
     enum CornerWidget { NoCornerWidgets = 0x00, LeftCornerWidget = 0x01,
                         RightCornerWidget = 0x02 };
diff --git a/src/widgets/widgets/qtabbar.cpp b/src/widgets/widgets/qtabbar.cpp
index 1b64301fa68..74e94cac4ae 100644
--- a/src/widgets/widgets/qtabbar.cpp
+++ b/src/widgets/widgets/qtabbar.cpp
@@ -1873,21 +1873,30 @@ void QTabBar::paintEvent(QPaintEvent *)
         QStyleOptionTab tabOption;
         const auto tab = d->tabList.at(selected);
         initStyleOption(&tabOption, selected);
+
         if (d->paintWithOffsets && tab->dragOffset != 0) {
+            // if the drag offset is != 0, a move is in progress (drag or animation)
+            // => set the tab position to Moving to preserve the rect
+            tabOption.position = QStyleOptionTab::TabPosition::Moving;
+
             if (vertical)
                 tabOption.rect.moveTop(tabOption.rect.y() + tab->dragOffset);
             else
                 tabOption.rect.moveLeft(tabOption.rect.x() + tab->dragOffset);
         }
-        if (!d->dragInProgress)
-            p.drawControl(QStyle::CE_TabBarTab, tabOption);
-        else {
-            int taboverlap = style()->pixelMetric(QStyle::PM_TabBarTabOverlap, nullptr, this);
-            if (verticalTabs(d->shape))
-                d->movingTab->setGeometry(tabOption.rect.adjusted(0, -taboverlap, 0, taboverlap));
-            else
-                d->movingTab->setGeometry(tabOption.rect.adjusted(-taboverlap, 0, taboverlap, 0));
-        }
+
+        // Calculate the rect of a moving tab
+        const int taboverlap = style()->pixelMetric(QStyle::PM_TabBarTabOverlap, nullptr, this);
+        const QRect &movingRect = verticalTabs(d->shape)
+                ? tabOption.rect.adjusted(0, -taboverlap, 0, taboverlap)
+                : tabOption.rect.adjusted(-taboverlap, 0, taboverlap, 0);
+
+        // If a drag is in process, set the moving tab's geometry here
+        // (in an animation, it is already set)
+        if (d->dragInProgress)
+            d->movingTab->setGeometry(movingRect);
+
+        p.drawControl(QStyle::CE_TabBarTab, tabOption);
     }
 
     // Only draw the tear indicator if necessary. Most of the time we don't need too.