less-pager does not update when window is resized

Reported by Klaus S. Madsen on 2007-09-04
Affects Status Importance Assigned to Milestone
less (Ubuntu)

Bug Description

Binary package hint: less

In gutsy (updated as of today, less version 406-0): Open a shell (I use RXVT), start less with a large file. Then resize the window. Note that less doesn't update until a key is pressed in the window. I feisty less updates as soon as the resize is completed.

strace of a less window being resized:

Process 13775 attached - interrupt to quit
read(3, 0xbfb79baf, 1) = ? ERESTARTSYS (To be restarted)
--- SIGWINCH (Window changed) @ 0 (0) ---
rt_sigaction(SIGWINCH, {0x805b310, [WINCH], SA_RESTART}, {0x805b310, [WINCH], SA_RESTART}, 8) = 0
sigreturn() = ? (mask now [])

Once a key is pressed, the following is appended to the trace:

read(3, "\33", 1) = 1
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig -icanon -echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig -icanon -echo ...}) = 0
ioctl(1, TIOCGWINSZ, {ws_row=35, ws_col=117, ws_xpixel=0, ws_ypixel=0}) = 0
ioctl(2, TIOCGWINSZ, {ws_row=35, ws_col=117, ws_xpixel=0, ws_ypixel=0}) = 0
write(1, "\33[H\33[2J\33[H<!DOCTYPE HTML PUBLIC "..., 1023) = 1023
write(1, " New Roman\", serif; font-size: 1"..., 1023) = 1023
time(NULL) = 1188901115
write(1, ": 14pt; so-language: zxx }\n "..., 544) = 544
read(3, "[", 1) = 1
write(1, "\r\33[KBrackets: \33[K[\10[\33[K]\10]\r\33[K", 30) = 30
write(1, "\r\33[K\33[7mNo bracket in top line "..., 51) = 51
read(3, "A", 1) = 1
write(1, "\33[35;1H", 7) = 7
write(1, "\7\r\33[K:\33[K", 9) = 9

The attached patch solves the problem for me. I haven't used it for long, so I'm not certain that there are no ill effects.

I've now been using my patched version of less for almost a month, and so far I haven't found any side-effects. Could this please get merged?

Changed in less:
status: New → Confirmed
Pádraig Brady (p-draigbrady) wrote :

same problem on fedora 8

Shaw Terwilliger (sterwill) wrote :

I first noticed this when I upgraded to Ubuntu 7.10. Annoying bug.

Albert Damen (albrt) wrote :

This bug has been fixed in Hardy (version 418-1).
From the upstream changelog:

Major changes between "less" versions 406 and 409
* Fix bug which caused screen to fail to repaint when window is resized.

Changed in less:
status: Confirmed → Fix Released
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