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Auto merge of #9300 - antrik:assert_empty_fontgroup, r=Ms2ger
layout/text.rs: Add assertion for empty fontgroup <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/9300) <!-- Reviewable:end -->
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@ -186,6 +186,8 @@ impl TextRunScanner {
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// Search for the first font in this font group that contains a glyph for this
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// character.
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let mut font_index = 0;
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// The following code panics one way or another if this condition isn't met.
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assert!(fontgroup.fonts.len() > 0);
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while font_index < fontgroup.fonts.len() - 1 {
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if fontgroup.fonts.get(font_index).unwrap().borrow()
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.glyph_index(character)
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