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QGtk3Interface: Explicitly add monospace font provider

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In case the current GTK3 theme has no monospace font defined, a
monospace font requested by a Qt application can trigger a GTK warning
"Theme parsing error: <data>:1:0: Expected a valid selector".
The warning is triggered by Qt requesting "{font-family: monospace;}".

In this case:
=> ensure fallback to GTK standard monospace font
=> request "* {font-family: monospace;}" to avoid the warning

Task-number: QTBUG-112896
Pick-to: 6.6 6.5
Change-Id: I24a8da62908af9b153245f53026af60e63a600d7
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>
This commit is contained in:
Axel Spoerl 2023-06-12 14:42:27 +02:00
parent 72d660843b
commit 8d1304f4f2
1 changed files with 2 additions and 1 deletions
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3
src/plugins/platformthemes/gtk3/qgtk3interface.cpp
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@ -608,7 +608,8 @@ QFont QGtk3Interface::font(QPlatformTheme::Font type) const
GtkCssProvider *cssProvider = nullptr;
if (type == QPlatformTheme::FixedFont) {
cssProvider = gtk_css_provider_new();
const char *fontSpec = "{font-family: monospace;}";
gtk_style_context_add_class (con, GTK_STYLE_CLASS_MONOSPACE);
const char *fontSpec = "* {font-family: monospace;}";
gtk_css_provider_load_from_data(cssProvider, fontSpec, -1, NULL);
gtk_style_context_add_provider(con, GTK_STYLE_PROVIDER(cssProvider),
GTK_STYLE_PROVIDER_PRIORITY_USER);