** Description changed:
+ [Impact]
+
+ With the addition of SIXEL support by default, tmux may crash due to
+ SIXEL images having no color or being unable to scale. This is most
+ often seen when opening neovim in a tmux session.
+
+ This fix will allow problematic SIXEL images to render without crashing
+ tmux, and most importantly will fix using neovim in tmux.
+
+ The bug is fixed through an upstream patch that adds checks for a lack
+ of colors or scalability in SIXEL images, while also freeing them
+ regardless of reflow state.
+
+ [Test Plan]
+
+ As stated by the reporter, the steps to reproduce are:
+
+ Steps to reproduce:
+ 1. SSH to a Noble machine
+ 2. Install latest stable release of neovim (0.10.0)
+ 3. Run tmux with 'tmux -vv' to spawn a server with verbose logging
+ 4. Run neovim with 'sudo nvim -u NONE'
+ 5. [server exited unexpectedly]
+
+ Observe in log (tmux-server-PID.log):
+ 1717870463.535540 input_enter_dcs
+ 1717870463.535557 screen_write_collect_flush: flushed 0 items
(screen_write_sixelimage)
+ 1717870463.535577 tty_cmd_sixelimage: image is 1x1
+ 1717870463.535595 tty_cmd_sixelimage: clamping to 0,0-1,1
+ 1717870463.535615 fatal: xcalloc: zero size
+
+ The bug is fixed when tmux no longer crashes after following these
+ instructions.
+
+
+ [Where problems could occur]
+
+ Based on the changes added through the commit, problems would be limited
+ to sixel image rendering. Previously, images with no colors or ability
+ to scale would lead to a crash. Now, however, they cause their
+ respective functions to bail out early. Likewise no color images cause
+ sixel_print() to return NULL. If other functions calling these do not
+ handle the results properly, then this may cause new issues. Finally,
+ when resizing the screen, all images are freed and redrawn regardless of
+ reflow. This may cause changes in behavior when resizing the screen
+ without reflow enabled.
+
+ [Other Info]
+
+ This bug has been fixed in Debian Sid and Oracular through the inclusion of
individual upstream commits as patches in 3.4-3
+
+ [Original Description]
+
Please sync tmux (main) from Oracular (main)
Noble was released with 3.4 which introduced half-baked Sixel support
enabled by default that now had two important crash fixes upstream.
** Changed in: tmux (Ubuntu Noble)
Status: Incomplete => In Progress
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https://bugs.launchpad.net/bugs/2068393
Title:
Two Sixel support fixes needed for stabilization on noble
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