AppMainWindow::raise: Use Qt's activateWindow

The work around doesn't seem to be needed anymore. The case that
is described is a Creator hitting a breakpoint, but not being raised.
This works for me on both gnome and kde with this workaround removed.

Removing the workaround also fixes:

Task-number: QTCREATORBUG-13845
Change-Id: I4f751c701a17ee39679b951b9cf7d52a68552d9f
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>

src/libs/utils/appmainwindow.cpp

@@ -37,11 +37,6 @@
 #include <QEvent>
 #include <QCoreApplication>
 
-#ifdef QTC_USE_QX11INFO
-#include <X11/Xlib.h>
-#include <QX11Info>
-#endif
-
 namespace Utils {
 
 /* The notification signal is delayed by using a custom event
@@ -64,27 +59,7 @@ void AppMainWindow::raiseWindow()
 
     raise();
 
-#if defined(QTC_USE_QX11INFO)
-    // Do the same as QWidget::activateWindow(), but with two differences
-    // * set newest timestamp (instead of userTime()). See QTBUG-24932
-    // * set source to 'pager'. This seems to do the trick e.g. on kwin even if
-    //   the app currently having focus is 'active' (but we hit a breakpoint).
-    XEvent e;
-    e.xclient.type = ClientMessage;
-    e.xclient.message_type = XInternAtom(QX11Info::display(), "_NET_ACTIVE_WINDOW", 1);
-    e.xclient.display = QX11Info::display();
-    e.xclient.window = winId();
-    e.xclient.format = 32;
-    e.xclient.data.l[0] = 2;     // pager!
-    e.xclient.data.l[1] = QX11Info::appTime(); // X11 time!
-    e.xclient.data.l[2] = None;
-    e.xclient.data.l[3] = 0;
-    e.xclient.data.l[4] = 0;
-    XSendEvent(QX11Info::display(), QX11Info::appRootWindow(),
-               false, SubstructureNotifyMask | SubstructureRedirectMask, &e);
-#else
     activateWindow();
-#endif
 }
 
 #ifdef Q_OS_WIN

src/libs/utils/utils.pro

@@ -3,17 +3,6 @@ QT += gui network
 include(../../qtcreatorlibrary.pri)
 include(utils-lib.pri)
 
-linux-* {
-    !isEmpty(QT.x11extras.name) {
-        QT += x11extras
-        CONFIG += x11
-        DEFINES += QTC_USE_QX11INFO
-    } else {
-        warning("x11extras module not found, raising the main window might not work. " \
-                "(The x11extras module is part of Qt 5.1 and later.)")
-    }
-}
-
 win32: LIBS += -luser32 -lshell32
 # PortsGatherer
 win32: LIBS += -liphlpapi -lws2_32