[gtksourceview] vim: allow shortcuts to pass through from Normal

[Christian Hergert <chergert src gnome org>]

commit 60c26c1fe7a949d2f9910279724065dca005ff20
Author: Christian Hergert <chergert redhat com>
Date:   Mon Dec 6 22:14:11 2021 -0800

    vim: allow shortcuts to pass through from Normal
    
    We want shortcuts to pass-through instead of being swallowed. However,
    there isn't really a way to know for sure what will end up being a
    shortcut and we can't test the GtkShortcutControllers up the hierarchy
    because handle_event() is private API.
    
    So instead just cheat and check for control/alt/super masks and empty
    strings to determine if it's something relatively safe to pass along.

 gtksourceview/vim/gtksourcevimnormal.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/gtksourceview/vim/gtksourcevimnormal.c b/gtksourceview/vim/gtksourcevimnormal.c
index 3ccd26b4..8d2ab835 100644
--- a/gtksourceview/vim/gtksourcevimnormal.c
+++ b/gtksourceview/vim/gtksourcevimnormal.c
@@ -1304,7 +1304,20 @@ key_handler_initial (GtkSourceVimNormal *self,
        }
 
        if (self->handler == key_handler_initial)
+       {
+               /* If this is possibly a shortcut (alt, control, etc) then we
+                * can let it pass through without being too likely to activate
+                * text insertion. Additionally, if there is no @string value
+                * then there isn't anything likely to be passed on to the
+                * textview to insert but it might be something like F10.
+                */
+               if ((mods & (GDK_CONTROL_MASK | GDK_SUPER_MASK | GDK_ALT_MASK)) != 0 || string[0] == 0)
+               {
+                       return FALSE;
+               }
+
                return gtk_source_vim_normal_bail (self);
+       }
 
        return self->handler (self, keyval, keycode, mods, string);
 }