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bug#56683: 29.0.50; long lines fix doesn't work correctly when lines are


From: Gregory Heytings
Subject: bug#56683: 29.0.50; long lines fix doesn't work correctly when lines are truncated
Date: Thu, 21 Jul 2022 19:45:19 +0000



I'm using emacs with `truncate-lines` set to `t` in my init.el. After the merge of #56393 I've rebuilt Emacs, and started testing the fix. I've noticed, that when lines are truncated, opening dictionary.json from the #45898 and pressing C-e doesn't move you to the end of the line, but stops somewhere inside it. E.g. with the default window width of Emacs -Q, I can see the following portion of the line

←, "hu": ["index"]}, "examples": [["en C la indicoj aperas interortajkrampoj, →

Arrows shown in the fringe indicate that there are more to the line on the right side.


You would have seen the same bug before the merge, so it's entirely unrelated to the merge. It is present at least in Emacs 24, 25, 26, 27 and 28.


As a side question, does these optimizations work with truncated lines? As far as I can tell Emacs is not as responsive as when the lines are wrapped, but I don't know how to measure this precisely.


They do work with truncated lines, but I suspect that truncated lines require specific fixes to work efficiently.
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