Extra check in monitor

app/SysTray-X/SysTray-X-app/windowctrl-unix.cpp

@@ -106,6 +106,22 @@ void    WindowCtrlUnix::updateX11WindowStates()
         qint32 n_wm_state;
         void* wm_state_ptr = GetWindowProperty( m_display, m_tb_windows.at( i ), "WM_STATE", &n_wm_state );
 
+        if( Error() )
+        {
+#ifdef DEBUG_DISPLAY_ACTIONS_DETAILS
+            emit signalConsole( QString( "Updatex11: Removing WinID %1").arg( m_tb_windows.at( i ) ) );
+#endif
+
+            /*
+             *  Window does not exist
+             */
+            m_tb_windows.removeAt( i );
+            m_tb_window_positions.removeAt( i );
+            m_tb_window_states_x11.removeAt( i );
+
+            continue;
+        }
+
         /*
          *  Get the state
          */
@@ -175,7 +191,7 @@ void    WindowCtrlUnix::updateX11WindowStates()
         if( ( current_state == Preferences::STATE_MINIMIZED || current_state == Preferences::STATE_DOCKED ) && current_state != getWindowState( m_tb_windows.at( i ) ) )
         {
 #ifdef DEBUG_DISPLAY_ACTIONS_DETAILS
-            emit signalConsole( QString( "WinID %1, state: %2").arg( m_tb_windows.at( i ) ).
+            emit signalConsole( QString( "Updatex11: WinID %1, state: %2").arg( m_tb_windows.at( i ) ).
                                 arg( Preferences::WindowStateString.at( m_tb_window_states[ m_tb_windows.at( i ) ] ) ) );
 
             for( int j = 0 ; j < atom_list.length() ; ++j )

app/SysTray-X/SysTray-X-lib-x11/systray-x-lib-x11.cpp

@@ -15,11 +15,19 @@
 #include <X11/Xutil.h>
 
 
+/*
+ *  X11 error state
+ * */
+bool    x11Error = false;
+
+
 /*
  *  Open the display
  */
 void*   OpenDisplay()
 {
+    x11Error = false;
+
     return XOpenDisplay( NULL );
 }
 
@@ -471,6 +479,7 @@ int ErrorHandler( Display* display, XErrorEvent* event )
     XGetErrorText( display, event->error_code, buf, 1024 );
     fprintf( stderr, "%s\n", buf );
 
+    x11Error = true;
     return 0;
 }
 
@@ -484,10 +493,24 @@ void    SetErrorHandler()
 }
 
 
+/*
+ *  Get the error state
+ */
+bool    Error()
+{
+    bool stete = x11Error;
+    x11Error = false;
+
+    return stete;
+}
+
+
 /*
  *  Unset the error handler
  */
 void    UnSetErrorHandler()
 {
+    x11Error = false;
+
     XSetErrorHandler( NULL );
 }

app/SysTray-X/SysTray-X-lib-x11/systray-x-lib-x11.h

@@ -266,6 +266,13 @@ void    MoveWindow( void* display, quint64 window, int x, int y );
  */
 void    SetErrorHandler();
 
+/**
+ * @brief Error. Get the error state.
+ *
+ *  @return     The error state.
+ */
+bool    Error();
+
 /**
  * @brief UnSetErrorHandler. Unset the x11 error handler.
  */