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e266380ee9
AppRun sets XDG_DATA_DIRS to
"$APPDIR/usr/local/share:$APPDIR/usr/share:$XDG_DATA_DIRS". When the host
leaves XDG_DATA_DIRS unset, the result contains no /usr/share, and setting
the variable at all suppresses the XDG default of /usr/local/share:/usr/share.
gdk-pixbuf 2.43+ (Arch, CachyOS, Gentoo, Fedora, openSUSE) no longer ships PNG,
JPEG or WebP as loader modules; libgdk_pixbuf links libglycin and decodes them
through it, and glycin discovers its loaders in
$XDG_DATA_DIRS/glycin-loaders/<ver>/conf.d/*.conf. With /usr/share missing,
glycin finds none and every PNG decode inside the AppImage fails with
"Unrecognized image file format".
RustDesk sends remote cursors to flutter_custom_cursor as PNG, and that plugin
returns nullptr from a std::string function when the decode fails, so the first
non-default cursor of a session aborts the process:
GdkPixbuf-CRITICAL **: gdk_pixbuf_copy: assertion 'GDK_IS_PIXBUF (pixbuf)' failed
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid
Debian and Ubuntu compile PNG straight into libgdk_pixbuf and never reach
glycin, which is why this only affects non-Debian hosts.
Append the two XDG defaults so they are present when the host does not provide
them. They go last, so a session that sets XDG_DATA_DIRS properly keeps its own
precedence, and appending is a no-op where those paths are already listed.
Verified on CachyOS (gdk-pixbuf 2.44.7) against a stock 1.4.9 AppImage: with
only this variable changed, a full remote session runs without crashing and
renders remote cursors correctly.
Refs #4565 #5457 #7013 #9164 #10563 #11499 #12257 #14305 #14405 #15625
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>