Occasionally the editor will not accept keyboard input. Usually, this occurs after a dialog box has been used to
interact with the editor, for example choosing "Navigate->Goto line". The editor is still usable via menu items, for
example, text can be highlighted and "cut" and "pasted" using the context menu. To regain keyboard input, I can usually
choose a file from the "files window" that I have not edited for some time, I then successful edit this file via
keyboard strokes, navigate back to the original file, then the editor accepts keyboards strokes again.
This is another case of issue 119617. Thanks for report
*** This issue has been marked as a duplicate of 119617 ***