From 289efa1b7b7859e5d5df5da598632d1e889207b2 Mon Sep 17 00:00:00 2001
From: Olaf Buddenhagen <antrik@users.sf.net>
Date: Thu, 14 Jan 2016 13:42:56 +0501
Subject: [PATCH] servo: Merge #9300 - layout/text.rs: Add assertion for empty
 fontgroup (from antrik:assert_empty_fontgroup); r=Ms2ger

Source-Repo: https://github.com/servo/servo
Source-Revision: a76de4b0cc2ec1e37539e9d328c9825c9812be78
---
 servo/components/layout/text.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/servo/components/layout/text.rs b/servo/components/layout/text.rs
index d28cea4c0e2b..c8ef3ad2b5de 100644
--- a/servo/components/layout/text.rs
+++ b/servo/components/layout/text.rs
@@ -186,6 +186,8 @@ impl TextRunScanner {
                     // Search for the first font in this font group that contains a glyph for this
                     // character.
                     let mut font_index = 0;
+                    // The following code panics one way or another if this condition isn't met.
+                    assert!(fontgroup.fonts.len() > 0);
                     while font_index < fontgroup.fonts.len() - 1 {
                         if fontgroup.fonts.get(font_index).unwrap().borrow()
                                           .glyph_index(character)