Fix C89 compatibility issue

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

gnome-font-viewer-c89.patch

@@ -0,0 +1,24 @@
+Match type of action_toggle_search_cb to its use
+
+This avoids an incompatible-pointer-types error and a build failure
+with GCC 14.
+
+Submitted upstream: <https://gitlab.gnome.org/GNOME/gnome-font-viewer/-/merge_requests/60>
+
+diff --git a/src/font-view-window.c b/src/font-view-window.c
+index 639ac33309b87135..24461f7f195c84f9 100644
+--- a/src/font-view-window.c
++++ b/src/font-view-window.c
+@@ -758,8 +758,11 @@ font_view_window_show_overview (FontViewWindow *self)
+ }
+ 
+ static void
+-action_toggle_search_cb (FontViewWindow *self)
++action_toggle_search_cb (GtkWidget  *widget,
++                         const char *action_name,
++                         GVariant   *parameter)
+ {
++  FontViewWindow *self = FONT_VIEW_WINDOW (widget);
+ 
+  gtk_toggle_button_set_active (self->search_button,
+                                !gtk_toggle_button_get_active (self->search_button));

gnome-font-viewer.spec

@@ -3,12 +3,13 @@
 
 Name:           gnome-font-viewer
 Version:        45.0
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Utility for previewing fonts for GNOME
 
 License:        GPL-2.0-or-later
 URL:            https://gitlab.gnome.org/GNOME/gnome-font-viewer
 Source0:        https://download.gnome.org/sources/gnome-font-viewer/%{major_version}/%{name}-%{tarball_version}.tar.xz
+Patch0: gnome-font-viewer-c89.patch
 
 BuildRequires:  gcc
 BuildRequires:  gettext
@@ -57,6 +58,9 @@ appstream-util validate-relax --nonet %{buildroot}%{_datadir}/metainfo/org.gnome
 %{_metainfodir}/org.gnome.font-viewer.appdata.xml
 
 %changelog
+* Sun Jan 21 2024 Florian Weimer <fweimer@redhat.com> - 45.0-3
+- Fix C89 compatibility issue
+
 * Fri Jan 19 2024 Fedora Release Engineering <releng@fedoraproject.org> - 45.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild