Revert "Revert "Make QWidget::activateWindow() NET window manager aware.""

This reverts commit 555175f9d9e5633b8fcfd6e6f6a11c84faa9946e.

3 files changed, 25 insertions, 1 deletions

diff --git a/src/gui/kernel/qapplication_x11.cpp b/src/gui/kernel/qapplication_x11.cpp
index ea44173..67e0865 100644
--- a/src/gui/kernel/qapplication_x11.cpp
+++ b/src/gui/kernel/qapplication_x11.cpp
@@ -275,6 +275,8 @@ static const char * x11_atomnames = {
 
     "_NET_SYSTEM_TRAY_VISUAL\0"
 
+    "_NET_ACTIVE_WINDOW\0"
+
     // Property formats
     "COMPOUND_TEXT\0"
     "TEXT\0"
diff --git a/src/gui/kernel/qt_x11_p.h b/src/gui/kernel/qt_x11_p.h
index e1b2625..7383382 100644
--- a/src/gui/kernel/qt_x11_p.h
+++ b/src/gui/kernel/qt_x11_p.h
@@ -632,6 +632,8 @@ struct QX11Data
 
         _NET_SYSTEM_TRAY_VISUAL,
 
+        _NET_ACTIVE_WINDOW,
+
         // Property formats
         COMPOUND_TEXT,
         TEXT,
diff --git a/src/gui/kernel/qwidget_x11.cpp b/src/gui/kernel/qwidget_x11.cpp
index 2266379..c1363d2 100644
--- a/src/gui/kernel/qwidget_x11.cpp
+++ b/src/gui/kernel/qwidget_x11.cpp
@@ -1641,7 +1641,27 @@ void QWidget::activateWindow()
         if (X11->userTime == 0)
             X11->userTime = X11->time;
         qt_net_update_user_time(tlw, X11->userTime);
-        XSetInputFocus(X11->display, tlw->internalWinId(), XRevertToParent, X11->time);
+
+        if (X11->isSupportedByWM(ATOM(_NET_ACTIVE_WINDOW))) {
+            XEvent e;
+            e.xclient.type = ClientMessage;
+            e.xclient.message_type = ATOM(_NET_ACTIVE_WINDOW);
+            e.xclient.display = X11->display;
+            e.xclient.window = tlw->internalWinId();
+            e.xclient.format = 32;
+            e.xclient.data.l[0] = 1;     // 1 == application
+            e.xclient.data.l[1] = X11->userTime;
+            if (QWidget *aw = QApplication::activeWindow())
+                e.xclient.data.l[2] = aw->internalWinId();
+            else
+                e.xclient.data.l[2] = XNone;
+            e.xclient.data.l[3] = 0;
+            e.xclient.data.l[4] = 0;
+            XSendEvent(X11->display, RootWindow(X11->display, tlw->x11Info().screen()),
+                       false, SubstructureNotifyMask | SubstructureRedirectMask, &e);
+        } else {
+            XSetInputFocus(X11->display, tlw->internalWinId(), XRevertToParent, X11->time);
+        }
     }
 }