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st/theme: Unref CRStylesheet after removing old theme nodes

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Since we now remove all theme nodes on a stylesheet change (ie.
StTheme's "custom-stylesheets-changed" signal) instead of only
invalidating them, those nodes may not be accessed anymore as soon as
"custom-stylesheets-changed" is emitted.

It turned out though that when comparing them to the newly generated
nodes in `st_widget_recompute_style()` using the
`st_theme_node_paint/geometry_equal()` functions, the properties of the
old nodes will still be accessed, causing a crash since the
CRDeclarations are already freed.

To fix that, keep the reference to the CRStylesheet, which owns the
CRDeclarations used by the theme nodes, around a bit longer, so it's
still possible to access the CRDeclarations inside the
"custom-stylesheets-changed" signal handler. This allows us to compare
the old theme nodes to the new ones since the CSS properties of both are
still valid.

Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2709
This commit is contained in:
Jonas Dreßler 2020-04-30 22:23:52 +02:00 committed by Florian Müllner
parent 05485fe04c
commit e06109c23c
1 changed files with 3 additions and 1 deletions
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4
src/st/st-theme.c
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@ -287,8 +287,10 @@ st_theme_unload_stylesheet (StTheme *theme,
theme->custom_stylesheets = g_slist_remove (theme->custom_stylesheets, stylesheet);
g_hash_table_remove (theme->stylesheets_by_file, file);
g_hash_table_remove (theme->files_by_stylesheet, stylesheet);
cr_stylesheet_unref (stylesheet);
g_signal_emit (theme, signals[STYLESHEETS_CHANGED], 0);
cr_stylesheet_unref (stylesheet);
}
/**