[gnome-builder] libide/sourceview: add expected TM_FILENAME variable

[Christian Hergert <chergert src gnome org>]

commit 812e5adb2c1c42602c50ee33e89be4405968461f
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jul 22 15:05:15 2022 -0700

    libide/sourceview: add expected TM_FILENAME variable
    
    This is used in GtkSourceView and is what text-mate used to expect.

 src/libide/sourceview/ide-source-view.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/libide/sourceview/ide-source-view.c b/src/libide/sourceview/ide-source-view.c
index 642977010..bfeab5a6f 100644
--- a/src/libide/sourceview/ide-source-view.c
+++ b/src/libide/sourceview/ide-source-view.c
@@ -636,6 +636,7 @@ ide_source_view_push_snippet (GtkSourceView    *source_view,
           IdeContext *ide_context;
 
           gtk_source_snippet_context_set_constant (context, "filename", basename);
+          gtk_source_snippet_context_set_constant (context, "TM_FILENAME", basename);
           gtk_source_snippet_context_set_constant (context, "dirname", g_file_peek_path (parent));
           gtk_source_snippet_context_set_constant (context, "path", g_file_peek_path (file));