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From: | Gregory Heytings |
Subject: | bug#61704: 29.0.60; Crash in get_narrowed_begv |
Date: | Wed, 22 Feb 2023 12:48:02 +0000 |
The cause is an arithmetic trap in get_narrowed_begv: return max ((pos / len - 1) * len, BEGV);where len is 0. The window was previously being resized, and has a pixel width of 24.
How can len possibly be 0 at that point? It is (in short) window_body_width (w, WINDOW_BODY_IN_CANONICAL_CHARS) * window_body_height (w, WINDOW_BODY_IN_CANONICAL_CHARS). We could add a condition in get_narrowed_len to return 1 when the result is 0, but it could be a bug somewhere else (can a window body have a zero width and/or height?), in which case it would be better to fix the bug there.
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