get rid of some unnecessary const_casts

src/activation.cpp

@@ -551,7 +551,7 @@ void Workspace::switchToOutput(Output *output)
 
 void Workspace::gotFocusIn(const Window *window)
 {
-    if (should_get_focus.contains(const_cast<Window *>(window))) {
+    if (should_get_focus.contains(window)) {
         // remove also all sooner elements that should have got FocusIn,
         // but didn't for some reason (and also won't anymore, because they were sooner)
         while (should_get_focus.first() != window) {

src/events.cpp

@@ -1117,7 +1117,7 @@ bool X11Window::buttonReleaseEvent(xcb_window_t w, int button, int state, int x,
         return true;
     }
     if (w == frameId() && workspace()->userActionsMenu() && workspace()->userActionsMenu()->isShown()) {
-        const_cast<UserActionsMenu *>(workspace()->userActionsMenu())->grabInput();
+        workspace()->userActionsMenu()->grabInput();
     }
     x = this->x(); // translate from grab window to local coords
     y = this->y();

src/rules.h

@@ -363,7 +363,7 @@ inline WindowRules::WindowRules()
 
 inline bool WindowRules::contains(const Rules *rule) const
 {
-    return rules.contains(const_cast<Rules *>(rule));
+    return rules.contains(rule);
 }
 
 inline void WindowRules::remove(Rules *rule)

src/tiles/tile.cpp

@@ -394,7 +394,7 @@ TileManager *Tile::manager() const
 int Tile::row() const
 {
     if (m_parentTile) {
-        return m_parentTile->m_children.indexOf(const_cast<Tile *>(this));
+        return m_parentTile->m_children.indexOf(this);
     }
 
     return -1;

src/workspace.h

@@ -306,7 +306,7 @@ public:
      * it's not already.
      */
     void showWindowMenu(const QRect &pos, Window *cl);
-    const UserActionsMenu *userActionsMenu() const
+    UserActionsMenu *userActionsMenu() const
     {
         return m_userActionsMenu;
     }

src/x11window.cpp

@@ -3404,7 +3404,7 @@ bool X11Window::hasTransientInternal(const X11Window *cl, bool indirect, QList<c
         return false;
     }
     // cl is group transient, search from top
-    if (transients().contains(const_cast<X11Window *>(cl))) {
+    if (transients().contains(cl)) {
         return true;
     }
     if (!indirect) {