[gnome-builder] completion: fix negative offset handling

[Christian Hergert <chergert src gnome org>]

commit 915a94b5fdf9be9122c9b30a69eacbc9d4afefda
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jun 9 03:31:08 2018 -0700

    completion: fix negative offset handling

 src/libide/completion/ide-completion-overlay.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/completion/ide-completion-overlay.c b/src/libide/completion/ide-completion-overlay.c
index 430cf2bf8..8a0d9b76d 100644
--- a/src/libide/completion/ide-completion-overlay.c
+++ b/src/libide/completion/ide-completion-overlay.c
@@ -210,7 +210,8 @@ ide_completion_overlay_get_child_position_cb (IdeCompletionOverlay *self,
   if (out_rect->x < 0)
     {
       out_rect->x = 0;
-      out_rect->width = alloc.width;
+      if (out_rect->width > alloc.width)
+        out_rect->width = alloc.width;
     }
 
   if (out_rect->y + out_rect->height > alloc.height)