Emit QScreen::(availableG|g)eometryChanged() on logical DPI change

When a change in logical DPI occurs due to the user changing the scaling
factor, the screen size in device independent pixels may change
due to High DPI choosing a different scale factor.

Factor out the commonly used code into QScreenPrivate methods
and use them from
QGuiApplicationPrivate::processScreenLogicalDotsPerInchChange().

Pick-to: 5.15
Task-number: QTBUG-76902
Task-number: QTBUG-79248
Change-Id: I241a0f52d8236a65084d501fb4d8f9faeea89c0f
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 2 insertions, 8 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 8e50cbc469..356f9fb11a 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -3131,14 +3131,7 @@ void QGuiApplicationPrivate::processScreenGeometryChange(QWindowSystemInterfaceP
             updateFilteredScreenOrientation(s);
     }
 
-    if (availableGeometryChanged)
-        emit s->availableGeometryChanged(s->availableGeometry());
-
-    if (geometryChanged || availableGeometryChanged) {
-        const auto siblings = s->virtualSiblings();
-        for (QScreen* sibling : siblings)
-            emit sibling->virtualGeometryChanged(sibling->virtualGeometry());
-    }
+    s->d_func()->emitGeometryChangeSignals(geometryChanged, availableGeometryChanged);
 
     resetCachedDevicePixelRatio();
 }
@@ -3156,6 +3149,7 @@ void QGuiApplicationPrivate::processScreenLogicalDotsPerInchChange(QWindowSystem
     s->d_func()->logicalDpi = QDpi(e->dpiX, e->dpiY);
 
     emit s->logicalDotsPerInchChanged(s->logicalDotsPerInch());
+    s->d_func()->updateGeometriesWithSignals();
 
     resetCachedDevicePixelRatio();
 }