Move (grow|shrink)(Horizontal|Vertical) to AbstractClient

A virtual base implementation is provided which does nothing. Needed
in AbstractClient to get Workspace::slotWindowGrow* to work with
active_client becoming an AbstractCliet.

abstract_client.cpp

@@ -55,4 +55,20 @@ bool AbstractClient::untab(const QRect &toGeometry, bool clientRemoved)
     return false;
 }
 
+void AbstractClient::growHorizontal()
+{
+}
+
+void AbstractClient::growVertical()
+{
+}
+
+void AbstractClient::shrinkHorizontal()
+{
+}
+
+void AbstractClient::shrinkVertical()
+{
+}
+
 }

abstract_client.h

@@ -104,6 +104,11 @@ public:
     virtual bool wantsInput() const = 0;
     virtual void checkWorkspacePosition(QRect oldGeometry = QRect(), int oldDesktop = -2) = 0;
 
+    virtual void growHorizontal();
+    virtual void shrinkHorizontal();
+    virtual void growVertical();
+    virtual void shrinkVertical();
+
     // TODO: remove boolean trap
     static bool belongToSameApplication(const AbstractClient* c1, const AbstractClient* c2, bool active_hack = false);
 

client.h

@@ -483,10 +483,10 @@ public:
      */
     void setQuickTileMode(QuickTileMode mode, bool keyboard = false);
 
-    void growHorizontal();
-    void shrinkHorizontal();
-    void growVertical();
-    void shrinkVertical();
+    void growHorizontal() override;
+    void shrinkHorizontal() override;
+    void growVertical() override;
+    void shrinkVertical() override;
 
     bool providesContextHelp() const;
     const QKeySequence &shortcut() const override;