Merge from 3.x: PR #4631

Fixes #4619

spyder/widgets/sourcecode/codeeditor.py

@@ -2416,7 +2416,7 @@ def setup_context_menu(self):
     def keyReleaseEvent(self, event):
         """Override Qt method."""
         self.timer_syntax_highlight.start()
-        super(CodeEditor, self).keyPressEvent(event)
+        super(CodeEditor, self).keyReleaseEvent(event)
 
     def keyPressEvent(self, event):
         """Reimplement Qt method"""