bug#61667: 29.0.60; Failure to redisplay

[Po Lu]

Dmitry Gutov <dgutov@yandex.ru> writes:

> This has been happening from time to time recently: I visit a file
> (either through recents or through project-find-file), and the buffer
> stays blank for a while, giving an appearance that it's "loading".
>
> But if I issue a new command (e.g. move the cursor), it redisplays
> instantly.
>
> This happens with my personal configuration, and rather randomly. How
> should I go about debugging it?
>
> In GNU Emacs 29.0.60 (build 101, x86_64-pc-linux-gnu, GTK+ Version
>  3.24.34, cairo version 1.16.0) of 2023-02-18 built on potemkin
> Repository revision: 6c0d8210175e72dcd7cef2ad77b8f8b680b240bc
> Repository branch: emacs-29
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
> System Description: Ubuntu 22.10
>
> Configured features:
> CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
> LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
> SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11
> XDBE XIM XINPUT2 XPM GTK3 ZLIB

Are you sure this is because redisplay is not happening, and not because
Emacs is stuck in xg_select?

If you hover over a tool bar button when this happens, or move the
mouse, does the button become highlighted or redisplay happen?