Fix tkinter focus problems on Linux (cztomczak#535).

cztomczak · cztomczak · commit 076b6a661246 · 2020-01-12T11:12:15.000+01:00
diff --git a/examples/tkinter_.py b/examples/tkinter_.py
@@ -219,6 +219,9 @@ def on_focus_in(self, _):
 
     def on_focus_out(self, _):
         logger.debug("BrowserFrame.on_focus_out")
+        """For focus problems see Issue #255 and Issue #535. """
+        if LINUX and self.browser:
+            self.browser.SetFocus(False)
 
     def on_root_close(self):
         if self.browser:
@@ -255,10 +258,15 @@ def OnTakeFocus(self, next_component, **_):
     def OnSetFocus(self, source, **_):
         logger.debug("FocusHandler.OnSetFocus, source={source}"
                      .format(source=source))
-        return True
+        if LINUX:
+            return False
+        else:
+            return True
 
     def OnGotFocus(self, **_):
         logger.debug("FocusHandler.OnGotFocus")
+        if LINUX:
+            self.browser_frame.focus_set()
 
 
 class NavigationBar(tk.Frame):
