patches/qtbase_5_12_8/0022-save-dirtyopaquechildren.patch

diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index bf339ca5c5..4cdf9189ad 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -5161,6 +5161,17 @@ void QWidget::render(QPainter *painter, const QPoint &targetOffset,
         return; // Fully transparent.
 
     Q_D(QWidget);
+
+    // Patch: save and restore dirtyOpaqueChildren field.
+    //
+    // Just like in QWidget::grab() this field should be restored
+    // after the d->render() call, because it will be set to 1 and
+    // opaqueChildren field will be filled with empty region in
+    // case the widget is hidden (because all the opaque children
+    // will be skipped in isVisible() check).
+    //
+    const bool oldDirtyOpaqueChildren = d->dirtyOpaqueChildren;
+
     const bool inRenderWithPainter = d->extra && d->extra->inRenderWithPainter;
     const QRegion toBePainted = !inRenderWithPainter ? d->prepareToRender(sourceRegion, renderFlags)
                                                      : sourceRegion;
@@ -5182,6 +5193,10 @@ void QWidget::render(QPainter *painter, const QPoint &targetOffset,
     if (!inRenderWithPainter && (opacity < 1.0 || (target->devType() == QInternal::Printer))) {
         d->render_helper(painter, targetOffset, toBePainted, renderFlags);
         d->extra->inRenderWithPainter = inRenderWithPainter;
+
+        // Patch: save and restore dirtyOpaqueChildren field.
+        d->dirtyOpaqueChildren = oldDirtyOpaqueChildren;
+
         return;
     }
 
@@ -5214,6 +5229,9 @@ void QWidget::render(QPainter *painter, const QPoint &targetOffset,
     d->setSharedPainter(oldPainter);
 
     d->extra->inRenderWithPainter = inRenderWithPainter;
+
+    // Patch: save and restore dirtyOpaqueChildren field.
+    d->dirtyOpaqueChildren = oldDirtyOpaqueChildren;
 }
 
 static void sendResizeEvents(QWidget *target)
@@ -8968,7 +8986,8 @@ bool QWidget::event(QEvent *event)
     case QEvent::KeyPress: {
         QKeyEvent *k = (QKeyEvent *)event;
         bool res = false;
-        if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
+        // Patch: Enable Ctrl+Tab and Ctrl+Shift+Tab / Ctrl+Backtab handle in-app.
+        if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier | Qt::MetaModifier))) {
             if (k->key() == Qt::Key_Backtab
                 || (k->key() == Qt::Key_Tab && (k->modifiers() & Qt::ShiftModifier)))
                 res = focusNextPrevChild(false);