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patch 8.0.0702: an error in a timer can make Vim unusable

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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.
This commit is contained in:
Bram Moolenaar
2017-07-08 22:37:34 +02:00
parent 11e79bb04e
commit c577d813b7
5 changed files with 50 additions and 10 deletions
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18
runtime/doc/eval.txt
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@@ -1,4 +1,4 @@
*eval.txt* For Vim version 8.0. Last change: 2017 Jun 25
*eval.txt* For Vim version 8.0. Last change: 2017 Jul 08
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -4189,14 +4189,14 @@ getchar([expr]) *getchar()*
not consumed. Return zero if no character available.
Without [expr] and when [expr] is 0 a whole character or
special key is returned. If it is an 8-bit character, the
special key is returned. If it is a single character, the
result is a number. Use nr2char() to convert it to a String.
Otherwise a String is returned with the encoded character.
For a special key it's a sequence of bytes starting with 0x80
(decimal: 128). This is the same value as the string
"\<Key>", e.g., "\<Left>". The returned value is also a
String when a modifier (shift, control, alt) was used that is
not included in the character.
For a special key it's a String with a sequence of bytes
starting with 0x80 (decimal: 128). This is the same value as
the String "\<Key>", e.g., "\<Left>". The returned value is
also a String when a modifier (shift, control, alt) was used
that is not included in the character.
When [expr] is 0 and Esc is typed, there will be a short delay
while Vim waits to see if this is the start of an escape
@@ -8017,6 +8017,10 @@ timer_start({time}, {callback} [, {options}])
"repeat" Number of times to repeat calling the
callback. -1 means forever. When not present
the callback will be called once.
If the timer causes an error three times in a
row the repeat is cancelled. This avoids that
Vim becomes unusable because of all the error
messages.
Example: >
func MyHandler(timer)