Ticket #3344 (new defect)
screen+mc: keys up/down skipping
| Reported by: | shamilbi | Owned by: | |
|---|---|---|---|
| Priority: | major | Milestone: | Future Releases |
| Component: | mc-core | Version: | 4.8.13 |
| Keywords: | mc screen up down | Cc: | egmont@… |
| Blocked By: | Blocking: | ||
| Branch state: | no branch | Votes for changeset: |
Description
since version 4.8.9 mc skips some keys up/down
1) start screen (or tmux)
2) start mc (version > 4.8.8)
3) press UP (or DOWN) several times (some of them will be skipped)
Change History
comment:2 Changed 10 years ago by egmont
@shamilbi:
What's your $TERM? Does the bug occur to you if you set it to xterm? (Normally it should be screen or screen-256color.)
Do you have mouse working inside screen? Is your mc buggy if you start without mouse support ("mc -d")?
Launch "strace -o /tmp/mctrace mc" and from another terminal check the file size of /tmp/mctrace a few times. Does it settle at a certain file size, or does it grow endlessly even when you don't use mc?
In st I've noticed the following (note: st sets TERM=st-256color, and does not support mouse at all):
When stracing, the trace reveals continuous activity, including trying to open /dev/gpmctl, even when mc seems to be idle.
Either setting TERM=xterm, or starting as "mc -d" makes the bug go away: input works as expected, and its strace only grows when you do something inside mc.
I don't face this with screen/tmux, however, I've found something probably closely related.
mc under st (suckless's terminal) doesn't immediately react to keypresses, you need to press e.g. the Down arrow 3 times and then suddenly it goes down by 3 lines, making it totally unusable.
This behavior also started with mc-4.8.9. Looking at the NEWS file, #2988 seems to be the only relevant change. Probably screen/tmux/st send the characters with some weird timing (e.g. a minor pause between the bytes) which causes trouble.