[gtksourceview/wip/chergert/vim] move insert back one character when leaving insert mode

[Christian Hergert <chergert src gnome org>]

commit 050402b16c3c0c89ac8c3f7257cead9ee470a182
Author: Christian Hergert <chergert redhat com>
Date:   Fri Oct 22 09:19:23 2021 -0700

    move insert back one character when leaving insert mode

 gtksourceview/vim/gtk-source-vim-insert.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
---
diff --git a/gtksourceview/vim/gtk-source-vim-insert.c b/gtksourceview/vim/gtk-source-vim-insert.c
index d0877b4c..6b83748f 100644
--- a/gtksourceview/vim/gtk-source-vim-insert.c
+++ b/gtksourceview/vim/gtk-source-vim-insert.c
@@ -174,6 +174,24 @@ gtk_source_vim_insert_handle_event (GtkSourceVimState *state,
        return FALSE;
 }
 
+static void
+gtk_source_vim_insert_leave (GtkSourceVimState *state)
+{
+       GtkSourceBuffer *buffer;
+       GtkTextIter insert;
+
+       g_assert (GTK_SOURCE_IS_VIM_INSERT (state));
+
+       buffer = gtk_source_vim_state_get_buffer (state, &insert, NULL);
+
+       /* Move the cursor back one character */
+       if (!gtk_text_iter_starts_line (&insert) &&
+           gtk_text_iter_backward_char (&insert))
+       {
+               gtk_text_buffer_select_range (GTK_TEXT_BUFFER (buffer), &insert, &insert);
+       }
+}
+
 static void
 gtk_source_vim_insert_dispose (GObject *object)
 {
@@ -189,6 +207,7 @@ gtk_source_vim_insert_class_init (GtkSourceVimInsertClass *klass)
        object_class->dispose = gtk_source_vim_insert_dispose;
 
        state_class->handle_event = gtk_source_vim_insert_handle_event;
+       state_class->leave = gtk_source_vim_insert_leave;
 }
 
 static void