Fix:graphics_qt5:Dont't clear windows on fake resize

Sometimes it happeenes that resize is called, but the new size equals
the old one. This change keeps the contents intact if that happens.

2 files changed, 13 insertions, 8 deletions

diff --git a/navit/graphics/qt5/QNavitQuick.cpp b/navit/graphics/qt5/QNavitQuick.cpp
index 6981f3af7..801827ebc 100644
--- a/navit/graphics/qt5/QNavitQuick.cpp
+++ b/navit/graphics/qt5/QNavitQuick.cpp
@@ -171,11 +171,14 @@ void QNavitQuick::geometryChanged(const QRectF& newGeometry, const QRectF& oldGe
         return;
     }
     if (graphics_priv->pixmap != NULL) {
-        delete graphics_priv->pixmap;
-        graphics_priv->pixmap = NULL;
+        if((width() != graphics_priv->pixmap->width()) || (height() != graphics_priv->pixmap->height())) {
+            delete graphics_priv->pixmap;
+            graphics_priv->pixmap = NULL;
+        }
+    }
+    if (graphics_priv->pixmap == NULL) {
+        graphics_priv->pixmap = new QPixmap(width(), height());
     }
-
-    graphics_priv->pixmap = new QPixmap(width(), height());
     painter = new QPainter(graphics_priv->pixmap);
     if (painter != NULL) {
         QBrush brush;
diff --git a/navit/graphics/qt5/QNavitWidget.cpp b/navit/graphics/qt5/QNavitWidget.cpp
index 9c2b96505..6fcc8084a 100644
--- a/navit/graphics/qt5/QNavitWidget.cpp
+++ b/navit/graphics/qt5/QNavitWidget.cpp
@@ -95,11 +95,13 @@ void QNavitWidget::paintEvent(QPaintEvent* event) {
 void QNavitWidget::resizeEvent(QResizeEvent* event) {
     QPainter* painter = NULL;
     if (graphics_priv->pixmap != NULL) {
-        delete graphics_priv->pixmap;
-        graphics_priv->pixmap = NULL;
+        if((width() != graphics_priv->pixmap->width()) || (height() != graphics_priv->pixmap->height())) {
+            delete graphics_priv->pixmap;
+            graphics_priv->pixmap = NULL;
+    }
+    if (graphics_priv->pixmap == NULL) {
+       graphics_priv->pixmap = new QPixmap(size());
     }
-
-    graphics_priv->pixmap = new QPixmap(size());
     painter = new QPainter(graphics_priv->pixmap);
     if (painter != NULL) {
         QBrush brush;