fix: 修复Qt 的 XCB 后端 GetProperty 有大量的 "BadAtom" 错误

平台插件中判断_NET_KDE_COMPOSITE_TOGGLING是否为0,如果是0就不做处理

Log: 修复Qt 的 XCB 后端 GetProperty 有大量的 "BadAtom" 错误
Bug: https://pms.uniontech.com/bug-view-237955.html
Influence: X11下应用日志 xcb"badatom"报错
Change-Id: I9620627f5b41c2a609d4df490eacdce802417a7f

Author: Whale107

xcb/dxcbwmsupport.cpp

@@ -171,6 +171,12 @@ void DXcbWMSupport::updateHasComposite()
     xcb_connection_t *xcb_connection = DPlatformIntegration::xcbConnection()->xcb_connection();
 
     auto atom = Utility::internAtom("_NET_KDE_COMPOSITE_TOGGLING");
+
+    if (atom == 0) {
+        qWarning() << "The value of atom:_NET_KDE_COMPOSITE_TOGGLING is 0 !";
+        return;
+    }
+
     xcb_window_t root = DPlatformIntegration::xcbConnection()->primaryScreen()->root();
 
     //stage1: check if _NET_KDE_COMPOSITE_TOGGLING is supported