Merge remote-tracking branch 'origin/5.12' into 5.13

Change-Id: I71cc71881fb638e207d83a8733bad8f267701c0f

2 files changed, 12 insertions, 3 deletions

diff --git a/src/gui/kernel/qplatformwindow.cpp b/src/gui/kernel/qplatformwindow.cpp
index d6f90c9254..562289a8c9 100644
--- a/src/gui/kernel/qplatformwindow.cpp
+++ b/src/gui/kernel/qplatformwindow.cpp
@@ -708,10 +708,11 @@ QRect QPlatformWindow::initialGeometry(const QWindow *w,
     const QScreen *screen = effectiveScreen(w);
     if (!screen)
         return initialGeometry;
+    const auto *wp = qt_window_private(const_cast<QWindow*>(w));
     QRect rect(QHighDpi::fromNativePixels(initialGeometry, w));
-    rect.setSize(fixInitialSize(rect.size(), w, defaultWidth, defaultHeight));
-    if (qt_window_private(const_cast<QWindow*>(w))->positionAutomatic
-            && w->type() != Qt::Popup) {
+    if (wp->resizeAutomatic)
+        rect.setSize(fixInitialSize(rect.size(), w, defaultWidth, defaultHeight));
+    if (wp->positionAutomatic && w->type() != Qt::Popup) {
         const QRect availableGeometry = screen->availableGeometry();
         // Center unless the geometry ( + unknown window frame) is too large for the screen).
         if (rect.height() < (availableGeometry.height() * 8) / 9
diff --git a/src/gui/kernel/qwindow_p.h b/src/gui/kernel/qwindow_p.h
index 25f9a8a9b2..b8fa77bef0 100644
--- a/src/gui/kernel/qwindow_p.h
+++ b/src/gui/kernel/qwindow_p.h
@@ -90,6 +90,7 @@ public:
         , receivedExpose(false)
         , positionPolicy(WindowFrameExclusive)
         , positionAutomatic(true)
+        , resizeAutomatic(true)
         , contentOrientation(Qt::PrimaryOrientation)
         , opacity(qreal(1.0))
         , minimumSize(0, 0)
@@ -156,6 +157,8 @@ public:
     virtual void processSafeAreaMarginsChanged() {};
 
     bool isPopup() const { return (windowFlags & Qt::WindowType_Mask) == Qt::Popup; }
+    void setAutomaticPositionAndResizeEnabled(bool a)
+    { positionAutomatic = resizeAutomatic = a; }
 
     static QWindowPrivate *get(QWindow *window) { return window->d_func(); }
 
@@ -179,6 +182,11 @@ public:
     bool receivedExpose;
     PositionPolicy positionPolicy;
     bool positionAutomatic;
+    // resizeAutomatic suppresses resizing by QPlatformWindow::initialGeometry().
+    // It also indicates that width/height=0 is acceptable (for example, for
+    // the QRollEffect widget) and is thus not cleared in setGeometry().
+    // An alternative approach might be using -1,-1 as a default size.
+    bool resizeAutomatic;
     Qt::ScreenOrientation contentOrientation;
     qreal opacity;
     QRegion mask;