panels: Use standard foreground colors when startup feedback is open

The startup feedback uses theme adjusted colors, we can use standard
foreground colors for the panels for better contrast rather than relying
on the shadow.

components/mobileshell/qml/components/StartupFeedbackPanelFill.qml

@@ -14,6 +14,8 @@ Rectangle {
     property int screen
     property var maximizedTracker
 
+    readonly property bool isShowing: height > 0
+
     // Smooth animation for colored rectangle
     NumberAnimation on height {
         id: heightAnim
@@ -29,6 +31,7 @@ Rectangle {
 
         function onShowingWindowChanged() {
             root.color = 'transparent';
+            root.height = 0;
         }
     }
 

containments/panel/qml/StatusBarWrapper.qml

@@ -21,11 +21,13 @@ Item {
     // Whether the background should be transparent, with content using a complementary theme on top.
     required property bool transparentBackground
 
+    // Whether the content should be forced to be white with a drop shadow
+    required property bool forcedComplementary
+
     // Request the panel itself to reapply settings (ex. for updating touch area).
     signal updatePanelPropertiesRequested()
 
-
-    Kirigami.Theme.colorSet: transparentBackground ? Kirigami.Theme.Complementary : Kirigami.Theme.Header
+    Kirigami.Theme.colorSet: forcedComplementary ? Kirigami.Theme.Complementary : Kirigami.Theme.Header
     Kirigami.Theme.inherit: false
 
     property real offset: 0
@@ -37,7 +39,7 @@ Item {
         showSecondRow: false
         showTime: !MobileShellState.LockscreenDBusClient.lockscreenActive // Don't show time on the lockscreen, since we already have a massive clock
 
-        showDropShadow: root.transparentBackground
+        showDropShadow: root.forcedComplementary
         backgroundColor: root.transparentBackground ? "transparent" : Kirigami.Theme.backgroundColor
 
         transform: [

containments/panel/qml/StatusPanel.qml

@@ -77,6 +77,14 @@ Item {
 
             return !containmentItem.showingApp && !containmentItem.fullscreen;
         }
+        forcedComplementary: {
+            if (MobileShellState.LockscreenDBusClient.lockscreenActive) {
+                return true;
+            }
+
+            // Force complementary colors (white) unless the startup feedback is showing
+            return transparentBackground && !startupFeedbackColorAnimation.isShowing
+        }
 
         state: {
             // If we are on the lockscreen, always show the status panel.

containments/taskpanel/qml/NavigationPanelComponent.qml

@@ -20,15 +20,20 @@ import org.kde.kirigami as Kirigami
 
 MobileShell.NavigationPanel {
     id: root
+
+    // Whether the bar background should be opaque
     required property bool opaqueBar
 
+    // Whether the content should be forced to be white
+    required property bool forcedComplementary
+
     // background is:
     // - opaque if an app is shown or vkbd is shown
     // - translucent if the task switcher is open
     // - transparent if on the homescreen
     backgroundColor: opaqueBar ? Kirigami.Theme.backgroundColor : "transparent"
-    foregroundColorGroup: opaqueBar ? Kirigami.Theme.Window : Kirigami.Theme.Complementary
-    shadow: !opaqueBar
+    foregroundColorGroup: forcedComplementary ? Kirigami.Theme.Complementary : Kirigami.Theme.Window
+    shadow: forcedComplementary
 
     MobileShellState.PanelSettingsDBusClient {
         id: panelSettings

containments/taskpanel/qml/main.qml

@@ -180,8 +180,10 @@ ContainmentItem {
         // load appropriate system navigation component
         NavigationPanelComponent {
             anchors.fill: parent
-            opaqueBar: root.opaqueBar
+
             isVertical: root.inLandscape
+            opaqueBar: root.opaqueBar
+            forcedComplementary: !opaqueBar && !startupFeedbackColorAnimation.isShowing
 
             transform: [
                 Translate {