Get windowRole from NETWinInfo instead doing it ourself

NETWinInfo provides windowRole if NET::WM2WindowRole is added to the
properties2. Thus KWin doesn't need to monitor and fetch itself, but
can just wrap the data provided by NETWinInfo.

In addition a signal is added to Toplevel whenever the window role
changes.

REVIEW: 117470

events.cpp

@@ -520,6 +520,9 @@ bool Client::windowEvent(xcb_generic_event_t *e)
         if (dirtyProperties2 & NET::WM2FrameOverlap) {
             // ### Inform the decoration
         }
+        if (dirtyProperties2.testFlag(NET::WM2WindowRole)) {
+            emit windowRoleChanged();
+        }
     }
 
     const uint8_t eventType = e->response_type & ~0x80;
@@ -1502,6 +1505,9 @@ bool Unmanaged::windowEvent(xcb_generic_event_t *e)
             emit opacityChanged(this, old_opacity);
         }
     }
+    if (dirtyProperties2.testFlag(NET::WM2WindowRole)) {
+        emit windowRoleChanged();
+    }
     const uint8_t eventType = e->response_type & ~0x80;
     switch (eventType) {
     case XCB_UNMAP_NOTIFY:
@@ -1558,8 +1564,6 @@ void Toplevel::propertyNotifyEvent(xcb_property_notify_event_t *e)
     default:
         if (e->atom == atoms->wm_client_leader)
             getWmClientLeader();
-        else if (e->atom == atoms->wm_window_role)
-            getWindowRole();
         else if (e->atom == atoms->kde_net_wm_shadow)
             getShadow();
         else if (e->atom == atoms->net_wm_opaque_region)

manage.cpp

@@ -91,6 +91,7 @@ bool Client::manage(xcb_window_t w, bool isMapped)
         NET::WMPid |
         NET::WMIconName;
     const NET::Properties2 properties2 =
+        NET::WM2WindowRole |
         NET::WM2UserTime |
         NET::WM2StartupId |
         NET::WM2ExtendedStrut |
@@ -103,7 +104,6 @@ bool Client::manage(xcb_window_t w, bool isMapped)
     m_colormap = attr.colormap;
 
     getResourceClass();
-    getWindowRole();
     getWmClientLeader();
     getWmClientMachine();
     getSyncCounter();

toplevel.cpp

@@ -124,7 +124,6 @@ void Toplevel::copyToDeleted(Toplevel* c)
     m_clientMachine = c->m_clientMachine;
     m_clientMachine->setParent(this);
     wmClientLeaderWin = c->wmClientLeader();
-    window_role = c->windowRole();
     opaque_region = c->opaqueRegion();
     m_screen = c->m_screen;
     m_skipCloseAnimation = c->m_skipCloseAnimation;
@@ -146,11 +145,6 @@ QRect Toplevel::visibleRect() const
     return r.translated(geometry().topLeft());
 }
 
-void Toplevel::getWindowRole()
-{
-    window_role = getStringProperty(window(), atoms->wm_window_role).toLower();
-}
-
 /*!
   Returns SM_CLIENT_ID property for a given window.
  */

toplevel.h

@@ -75,7 +75,7 @@ class Toplevel
     Q_PROPERTY(QSize clientSize READ clientSize)
     Q_PROPERTY(QByteArray resourceName READ resourceName)
     Q_PROPERTY(QByteArray resourceClass READ resourceClass)
-    Q_PROPERTY(QByteArray windowRole READ windowRole)
+    Q_PROPERTY(QByteArray windowRole READ windowRole NOTIFY windowRoleChanged)
     /**
      * Returns whether the window is a desktop background window (the one with wallpaper).
      * See _NET_WM_WINDOW_TYPE_DESKTOP at http://standards.freedesktop.org/wm-spec/wm-spec-latest.html .
@@ -367,6 +367,11 @@ Q_SIGNALS:
      **/
     void screenChanged();
     void skipCloseAnimationChanged();
+    /**
+     * Emitted whenever the window role of the window changes.
+     * @since 5.0
+     **/
+    void windowRoleChanged();
 
 protected Q_SLOTS:
     /**
@@ -400,7 +405,6 @@ protected:
     void getWmOpaqueRegion();
 
     void getResourceClass();
-    void getWindowRole();
     void getSkipCloseAnimation();
     virtual void debug(QDebug& stream) const = 0;
     void copyToDeleted(Toplevel* c);
@@ -433,7 +437,6 @@ private:
     QByteArray resource_class;
     ClientMachine *m_clientMachine;
     WId wmClientLeaderWin;
-    QByteArray window_role;
     bool unredirect;
     bool unredirectSuspend; // when unredirected, but pixmap is needed temporarily
     bool m_damageReplyPending;
@@ -659,7 +662,7 @@ inline QByteArray Toplevel::resourceClass() const
 
 inline QByteArray Toplevel::windowRole() const
 {
-    return window_role;
+    return QByteArray(info->windowRole());
 }
 
 inline bool Toplevel::unredirected() const

unmanaged.cpp

@@ -65,9 +65,8 @@ bool Unmanaged::track(Window w)
     vis = attr.visual;
     bit_depth = attr.depth;
     info = new NETWinInfo(connection(), w, rootWindow(),
-                          NET::WMWindowType | NET::WMPid, NET::WM2Opacity);
+                          NET::WMWindowType | NET::WMPid, NET::WM2Opacity | NET::WM2WindowRole);
     getResourceClass();
-    getWindowRole();
     getWmClientLeader();
     getWmClientMachine();
     if (Xcb::Extensions::self()->isShapeAvailable())