patch 8.0.0702: an error in a timer can make Vim unusablev8.0.0702

Problem:    An error in a timer can make Vim unusable.
Solution:   Don't set the error flag or exception from a timer.  Stop a timer
            if it causes an error 3 out of 3 times.  Discard an exception
            caused inside a timer.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/structs.h b/src/structs.h
index 0fbc5a5bd..c3f120008 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -3243,6 +3243,7 @@ struct timer_S
     long	tr_interval;	    /* msec */
     char_u	*tr_callback;	    /* allocated */
     partial_T	*tr_partial;
+    int		tr_emsg_count;
 #endif
 };