[balsa] fix Webkit related crash

[Albrecht Dreß <albrecht src gnome org>]

commit f1f04a6d75e34de17dd66d8772c861a114aa4943
Author: Albrecht Dreß <albrecht dress netcologne de>
Date:   Sat Sep 17 14:08:50 2022 +0200

    fix Webkit related crash
    
    Disable Webkit hardware acceleration which seems to cause segfaults on at
    least some systems running Wayland (probably the same issue as this one:
    https://github.com/NixOS/nixpkgs/issues/168939).  Thanks to @pawels for
    tracking down this issue and the patch!

 libbalsa/html.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/libbalsa/html.c b/libbalsa/html.c
index 646ebd08c..67e943647 100644
--- a/libbalsa/html.c
+++ b/libbalsa/html.c
@@ -660,6 +660,7 @@ lbh_get_web_view_context(void)
                WebKitWebContext *tmp;
                WebKitWebView *view;
                gchar *cache_dir;
+               WebKitSettings *settings;
 
                cache_dir = g_build_filename(g_get_home_dir(), ".balsa", CACHE_DIR, NULL);
                data_manager = webkit_website_data_manager_new("base-cache-directory", cache_dir, NULL);
@@ -688,6 +689,11 @@ lbh_get_web_view_context(void)
 
                /* create a dummy view to trigger loading the html filter extension */
                view = WEBKIT_WEB_VIEW(webkit_web_view_new_with_context(tmp));
+               settings = webkit_web_view_get_settings(view);
+               /* note: enabling hardware acceleration seems to trigger strange segfaults in Webkit at least 
on some systems running
+                * Wayland (probably the same issue as https://github.com/NixOS/nixpkgs/issues/168939), so we 
just disable it
+                * completely */
+               webkit_settings_set_hardware_acceleration_policy(settings, 
WEBKIT_HARDWARE_ACCELERATION_POLICY_NEVER);
                webkit_web_view_load_uri(view, "about:blank");
                while (webkit_web_view_is_loading(view)) {
                        gtk_main_iteration_do(FALSE);
@@ -721,6 +727,8 @@ lbh_web_view_new(LibBalsaWebKitInfo *info,
     gtk_widget_set_vexpand(GTK_WIDGET(view), TRUE);
 
        settings = webkit_web_view_get_settings(view);
+       /* might be paranoid - see note in function lbh_get_web_view_context() above */
+       webkit_settings_set_hardware_acceleration_policy(settings, WEBKIT_HARDWARE_ACCELERATION_POLICY_NEVER);
 #if WEBKIT_CHECK_VERSION(2, 31, 91)
     g_object_set(G_OBJECT(settings), "enable-plugins", FALSE, NULL);
 #else  /* WEBKIT_CHECK_VERSION(2, 31, 91) */