1 files changed, 24 insertions, 8 deletions
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index a0b1ddb434..f4c455f278 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -1091,21 +1091,37 @@ QXcbWindow::NetWmStates QXcbWindow::netWmStates()
 void QXcbWindow::setNetWmStates(NetWmStates states)
 {
     QVector<xcb_atom_t> atoms;
-    if (states & NetWmStateAbove)
+
+    xcb_get_property_cookie_t get_cookie =
+        xcb_get_property_unchecked(xcb_connection(), 0, m_window, atom(QXcbAtom::_NET_WM_STATE),
+                         XCB_ATOM_ATOM, 0, 1024);
+
+    xcb_get_property_reply_t *reply =
+        xcb_get_property_reply(xcb_connection(), get_cookie, NULL);
+
+    if (reply && reply->format == 32 && reply->type == XCB_ATOM_ATOM && reply->value_len > 0) {
+        const xcb_atom_t *data = static_cast<const xcb_atom_t *>(xcb_get_property_value(reply));
+        atoms.resize(reply->value_len);
+        memcpy((void *)&atoms.first(), (void *)data, reply->value_len * sizeof(xcb_atom_t));
+    }
+
+    free(reply);
+
+    if (states & NetWmStateAbove && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_ABOVE)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_ABOVE));
-    if (states & NetWmStateBelow)
+    if (states & NetWmStateBelow && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_BELOW)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_BELOW));
-    if (states & NetWmStateFullScreen)
+    if (states & NetWmStateFullScreen && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_FULLSCREEN)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_FULLSCREEN));
-    if (states & NetWmStateMaximizedHorz)
+    if (states & NetWmStateMaximizedHorz && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_HORZ)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_HORZ));
-    if (states & NetWmStateMaximizedVert)
+    if (states & NetWmStateMaximizedVert && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_VERT)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_VERT));
-    if (states & NetWmStateModal)
+    if (states & NetWmStateModal && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_MODAL)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_MODAL));
-    if (states & NetWmStateStaysOnTop)
+    if (states & NetWmStateStaysOnTop && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_STAYS_ON_TOP)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_STAYS_ON_TOP));
-    if (states & NetWmStateDemandsAttention)
+    if (states & NetWmStateDemandsAttention && !atoms.contains(atom(QXcbAtom::_NET_WM_STATE_DEMANDS_ATTENTION)))
         atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_DEMANDS_ATTENTION));
 
     if (atoms.isEmpty()) {