Allow disabling expo cells

This allows making specific windows in a WindowHeap static.

src/effects/private/expolayout.cpp

@@ -36,12 +36,34 @@ void ExpoCell::setLayout(ExpoLayout *layout)
         m_layout->removeCell(this);
     }
     m_layout = layout;
-    if (m_layout) {
+    if (m_layout && m_enabled) {
         m_layout->addCell(this);
     }
     Q_EMIT layoutChanged();
 }
 
+bool ExpoCell::isEnabled() const
+{
+    return m_enabled;
+}
+
+void ExpoCell::setEnabled(bool enabled)
+{
+    if (m_enabled != enabled) {
+        m_enabled = enabled;
+        if (enabled) {
+            if (m_layout) {
+                m_layout->addCell(this);
+            }
+        } else {
+            if (m_layout) {
+                m_layout->removeCell(this);
+            }
+        }
+        Q_EMIT enabledChanged();
+    }
+}
+
 void ExpoCell::update()
 {
     if (m_layout) {

src/effects/private/expolayout.h

@@ -76,6 +76,7 @@ class ExpoCell : public QObject
 {
     Q_OBJECT
     Q_PROPERTY(ExpoLayout *layout READ layout WRITE setLayout NOTIFY layoutChanged)
+    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled NOTIFY enabledChanged)
     Q_PROPERTY(int naturalX READ naturalX WRITE setNaturalX NOTIFY naturalXChanged)
     Q_PROPERTY(int naturalY READ naturalY WRITE setNaturalY NOTIFY naturalYChanged)
     Q_PROPERTY(int naturalWidth READ naturalWidth WRITE setNaturalWidth NOTIFY naturalWidthChanged)
@@ -91,6 +92,9 @@ public:
     explicit ExpoCell(QObject *parent = nullptr);
     ~ExpoCell() override;
 
+    bool isEnabled() const;
+    void setEnabled(bool enabled);
+
     ExpoLayout *layout() const;
     void setLayout(ExpoLayout *layout);
 
@@ -132,6 +136,7 @@ public Q_SLOTS:
 
 Q_SIGNALS:
     void layoutChanged();
+    void enabledChanged();
     void naturalXChanged();
     void naturalYChanged();
     void naturalWidthChanged();
@@ -145,6 +150,7 @@ Q_SIGNALS:
 
 private:
     QString m_persistentKey;
+    bool m_enabled = true;
     int m_naturalX = 0;
     int m_naturalY = 0;
     int m_naturalWidth = 0;

src/effects/private/qml/WindowHeap.qml

@@ -167,6 +167,7 @@ FocusScope {
                 ExpoCell {
                     id: cell
                     layout: expoLayout
+                    enabled: !thumb.hidden
                     naturalX: thumb.client.x
                     naturalY: thumb.client.y
                     naturalWidth: thumb.client.width