bug#19718: read_filtered_event echos mouse events until character is inputted

[Nick Andryshak]

See this Stack Exchange question: 

http://emacs.stackexchange.com/questions/7443/mouse-problem-in-org-mode-export-window

The asker is trying to use the mouse wheel to scroll the org-export-dispatch

window. org-export-dispatch is using the built-in function read-char-exclusive,

which in turn calls read_filtered_event with the parameter error_nonascii set to

0. Unlike read-char, which will throw an error upon receiving a mouse event,

read-char-exclusive just keeps retrying, and eventually the echo area will

become full of mouse event names.

Here's the git diff of a small, possible fix for this issue:

$ git diff

diff --git a/src/lread.c b/src/lread.c

index 69ec059..0041b03 100644

--- a/src/lread.c

+++ b/src/lread.c

@@ -651,7 +651,10 @@ read_filtered_event (bool no_switch_frame, bool ascii_required,

              error ("Non-character input-event");

            }

          else

-           goto retry;

+            {

+              message1 (0);

+              goto retry;

+            }

        }

     }

Nick Andryshak