Re: possible bug in redisplay
Ar an dara lá de mí Eanair, scríobh Julian Bradfield:
I can reproduce it in a standard 21.4.21 (but with my extensive
.emacs, as it's font-dependent). Of course, a standard build doesn't
have error-checking turned on, so instead of a crash, one sees a
momentary glitch. Here's the sequence of events from the user
perspective:
search to the end of the desired narrowing region, set mark.
Move (by C-p) to the beginning of the desired region.
C-x n n
The region narrows and displays as expected.
M->
The end of the region is displayed as expected.
M-<
The start of the region is displayed centered in the window, and above
it are the preceding lines from the file, outside the narrowed region.
Well, that’s pretty definitively our bug! And your change adds one extra
assembler instruction, not something we need to worry about. We should apply
it.
One can move about with keystrokes in the region, but changing it,
or
even moving the mouse, causes the display to correct itself.
I can't get it in 21.5, because the font setup is different, and I
can't remember how to make 21.5 use the same fonts as I use in 21.4.
Post your font setup and we can manage that, I think.
--
‘Liston operated so fast that he once accidentally amputated an assistant’s
fingers along with a patient’s leg, […] The patient and the assistant both
died of sepsis, and a spectator reportedly died of shock, resulting in the
only known procedure with a 300% mortality.’ (Atul Gawande, NEJM, 2012)
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