[shell] Pass the panel visibility mode to KWayland PanelBehavior

Summary:
The visibility mode needs to be passed to KWayland by mapping to the
PanelBehavior. This is required to pass the correct hint to KWin to
adjust the layering, etc.

BUG: 368499

Reviewers: #plasma

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D2789

shell/panelview.cpp

@@ -316,12 +316,39 @@ void PanelView::setVisibilityMode(PanelView::VisibilityMode mode)
         m_corona->requestApplicationConfigSync();
     }
 
+    visibilityModeToWayland();
     updateStruts();
 
     emit visibilityModeChanged();
     restoreAutoHide();
 }
 
+void PanelView::visibilityModeToWayland()
+{
+    if (!m_shellSurface) {
+        return;
+    }
+    KWayland::Client::PlasmaShellSurface::PanelBehavior behavior;
+    switch (m_visibilityMode) {
+    case NormalPanel:
+        behavior = KWayland::Client::PlasmaShellSurface::PanelBehavior::AlwaysVisible;
+        break;
+    case AutoHide:
+        behavior = KWayland::Client::PlasmaShellSurface::PanelBehavior::AutoHide;
+        break;
+    case LetWindowsCover:
+        behavior = KWayland::Client::PlasmaShellSurface::PanelBehavior::WindowsCanCover;
+        break;
+    case WindowsGoBelow:
+        behavior = KWayland::Client::PlasmaShellSurface::PanelBehavior::WindowsGoBelow;
+        break;
+    default:
+        Q_UNREACHABLE();
+        return;
+    }
+    m_shellSurface->setPanelBehavior(behavior);
+}
+
 PanelView::VisibilityMode PanelView::visibilityMode() const
 {
     return m_visibilityMode;

shell/panelview.h

@@ -198,6 +198,7 @@ private:
     bool containmentContainsPosition(const QPointF &point) const;
     QPointF positionAdjustedForContainment(const QPointF &point) const;
     void setupWaylandIntegration();
+    void visibilityModeToWayland();
     bool edgeActivated() const;
     void updateEnabledBorders();
     bool canSetStrut() const;