compute blur area correctly on startup

--improve calculations for Effects area during startup
and at the same time when the dock is totally hidden
so it should not paint any effects area at all.

BUG:416928
FIXED-IN:0.9.9

app/view/effects.cpp

@@ -294,22 +294,12 @@ QRect Effects::rect() const
 
 void Effects::setRect(QRect area)
 {
-    if (KWindowSystem::compositingActive()) {
-        QRect inWindowRect = area.intersected(QRect(0, 0, m_view->width(), m_view->height()));
-
-        if (m_rect == inWindowRect) {
-            return;
-        }
-
-        m_rect = inWindowRect;
-    } else {
-        if (m_rect == area) {
-            return;
-        }
-
-        m_rect = area;
+    if (m_rect == area) {
+        return;
     }
 
+    m_rect = area;
+
     emit rectChanged();
 }
 
@@ -417,14 +407,19 @@ void Effects::updateEffects()
             m_background->setImagePath(QStringLiteral("widgets/panel-background"));
         }
 
+        QRect inWindowRect = m_rect;
+        if (KWindowSystem::compositingActive()) {
+            inWindowRect = m_rect.intersected(QRect(0, 0, m_view->width(), m_view->height()));
+        }
+
         m_background->setEnabledBorders(m_enabledBorders);
-        m_background->resizeFrame(m_rect.size());
+        m_background->resizeFrame(inWindowRect.size());
         QRegion fixedMask = m_background->mask();
-        fixedMask.translate(m_rect.x(), m_rect.y());
+        fixedMask.translate(inWindowRect.x(), inWindowRect.y());
 
         //! fix1, for KF5.32 that return empty QRegion's for the mask
         if (fixedMask.isEmpty()) {
-            fixedMask = QRegion(m_rect);
+            fixedMask = QRegion(inWindowRect);
         }
 
         KWindowEffects::enableBlurBehind(m_view->winId(), true, fixedMask);

containment/package/contents/ui/PanelBox.qml

@@ -402,7 +402,7 @@ Item{
             //! Fix for FrameSvgItem QML version not updating its margins after a theme change
             //! with this hack we enforce such update. I could use the repaintNeeded signal but
             //! it is called more often than the themeChanged one.
-            Connections{
+            Connections {
                 target: themeExtended
                 onThemeChanged: {
                     solidBackground.adjustPrefix();
@@ -412,6 +412,12 @@ Item{
                 }
             }
 
+            Connections {
+                target: latteView ? latteView.visibility : null
+                onIsHiddenChanged: solidBackground.updateEffectsArea();
+            }
+
+
             Connections{
                 target: plasmoid
                 onLocationChanged: solidBackground.adjustPrefix();
@@ -421,17 +427,24 @@ Item{
                 if (!latteView)
                     return;
 
-                if (!root.behaveAsPlasmaPanel) {
-                    var rootGeometry = mapToItem(root, 0, 0);
-                    efGeometry.x = rootGeometry.x;
-                    efGeometry.y = rootGeometry.y;
-                } else {
+                if (latteView.visibility.isHidden) {
                     efGeometry.x = 0;
                     efGeometry.y = 0;
-                }
+                    efGeometry.width = 0;
+                    efGeometry.height = 0;
+                } else {
+                    if (!root.behaveAsPlasmaPanel) {
+                        var rootGeometry = mapToItem(root, 0, 0);
+                        efGeometry.x = rootGeometry.x;
+                        efGeometry.y = rootGeometry.y;
+                    } else {
+                        efGeometry.x = 0;
+                        efGeometry.y = 0;
+                    }
 
-                efGeometry.width = width;
-                efGeometry.height = height;
+                    efGeometry.width = width;
+                    efGeometry.height = height;
+                }
 
                 latteView.effects.rect = efGeometry;