Do not redraw the dialog on activate

doc/TODO

@@ -20,6 +20,8 @@ Missing Features
      └──► tmp
 ---------------------------------------
 
+- Screen characters should get the options transparent 
+  and transparent with color
 - FDialog title button [▲] and [▼] should maximized or restore 
   the window size on a resizeable dialog
 - A possibility to change the window size dynamically with the mouse

src/fdialog.cpp

@@ -1033,6 +1033,7 @@ void FDialog::activateDialog()
     if ( ! focusFirstChild() )
       old_focus->unsetFocus();
 
+    if ( ! old_focus->isWindow() )
       old_focus->redraw();
   }