[gnome-builder] libide/code: fix 0-1 in highlight engine

[Christian Hergert <chergert src gnome org>]

commit cd918f0eac00b2fbbdd29a2f59262e1d04c32418
Author: Christian Hergert <chergert redhat com>
Date:   Thu Sep 15 20:38:30 2022 -0700

    libide/code: fix 0-1 in highlight engine

 src/libide/code/ide-highlight-engine.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/libide/code/ide-highlight-engine.c b/src/libide/code/ide-highlight-engine.c
index 56cb47e68..1b5666178 100644
--- a/src/libide/code/ide-highlight-engine.c
+++ b/src/libide/code/ide-highlight-engine.c
@@ -702,8 +702,8 @@ ide_highlight_engine__unbind_buffer_cb (IdeHighlightEngine  *self,
 
   gtk_source_scheduler_clear (&self->work_scheduled);
 
-  length = _cjh_text_region_get_length (self->region);
-  _cjh_text_region_remove (self->region, 0, length - 1);
+  if ((length = _cjh_text_region_get_length (self->region)))
+    _cjh_text_region_remove (self->region, 0, length - 1);
 
   if (text_buffer != NULL)
     {