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bug#56393: Turn on narrowing in redisplay_window
From: |
Gerd Möllmann |
Subject: |
bug#56393: Turn on narrowing in redisplay_window |
Date: |
Tue, 19 Jul 2022 11:25:53 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (darwin) |
Gregory Heytings <gregory@heytings.org> writes:
>> - I don't understand this in redisplay_window:
>>
>> /* Check whether the buffer to be displayed contains long lines. */
>> if (!NILP (Vlong_line_threshold)
>> && !current_buffer->long_line_optimizations_p
>> && Z - BEG - BUF_UNCHANGED_SIZE (current_buffer) <= 1)
>>
>> Does the last line mean "buffer got smaller"? Sorry if I'm dense
>> here, but I don't get it.
>>
>
> It is (- (point-max) (point-min) (buffer-size-after-last-redisplay)),
Sorry, maybe it's too hot here to think (36°C currently), I still don't
get it
(- (point-max) (point-min)) = current buffer size
so
current-buffer-size - last-buffer-size <= 1
current-buffer-size <= 1 + last-buffer-size
which is "the buffer got smaller"?
> so it means "the buffer got larger by more than one character". (Note
> that (buffer-size-after-last-redisplay) is a fictional function.)
Goes without saying.
> But after discussing this with Eli I'm not convinced that it's a good
> enough heuristic. The previous heuristic was simply "the buffer
> contents have changed", and I wanted to refine it a bit.
Okay. Hm.
- bug#56393: Actually fix the long lines display bug, (continued)
- bug#56393: Actually fix the long lines display bug, Gregory Heytings, 2022/07/19
- bug#56393: Resetting long_line_optimization_p to 0, Gerd Möllmann, 2022/07/19
- bug#56393: Resetting long_line_optimization_p to 0, Gregory Heytings, 2022/07/19
- bug#56393: Resetting long_line_optimization_p to 0, Gerd Möllmann, 2022/07/19
- bug#56393: Actually fix the long lines display bug, Gerd Möllmann, 2022/07/20
- bug#56393: Actually fix the long lines display bug, Gregory Heytings, 2022/07/20
- bug#56393: Actually fix the long lines display bug, Eli Zaretskii, 2022/07/19
- bug#56393: Auto narrowing autside of redisplay, Gerd Möllmann, 2022/07/19
- bug#56393: Auto narrowing autside of redisplay, Gregory Heytings, 2022/07/19
- bug#56393: Actually fix the long lines display bug, Gerd Möllmann, 2022/07/19
- bug#56393: Turn on narrowing in redisplay_window,
Gerd Möllmann <=
- bug#56393: Turn on narrowing in redisplay_window, Gregory Heytings, 2022/07/19
- bug#56393: Turn on narrowing in redisplay_window, Gerd Möllmann, 2022/07/19
- bug#56393: Turn on narrowing in redisplay_window, Eli Zaretskii, 2022/07/19
- bug#56393: Actually fix the long lines display bug, Gerd Möllmann, 2022/07/20
- bug#56393: Actually fix the long lines display bug, Gregory Heytings, 2022/07/20
- bug#56393: Actually fix the long lines display bug, Eli Zaretskii, 2022/07/19
- bug#56393: Actually fix the long lines display bug, Gerd Möllmann, 2022/07/20