From f426b644ca179e40d009ec58afa643d1c5489af0 Mon Sep 17 00:00:00 2001
From: Jonathan Kew <jkew@mozilla.com>
Date: Fri, 31 Jan 2020 10:11:19 +0000
Subject: [PATCH] style: Don't apply text-combine-upright in sideways-* writing
 modes.

Differential Revision: https://phabricator.services.mozilla.com/D61326
---
 components/style/style_adjuster.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/style/style_adjuster.rs b/components/style/style_adjuster.rs
index a66c9462c92..2a897bbe151 100644
--- a/components/style/style_adjuster.rs
+++ b/components/style/style_adjuster.rs
@@ -281,7 +281,7 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
         let writing_mode = self.style.get_inherited_box().clone_writing_mode();
         let text_combine_upright = self.style.get_inherited_text().clone_text_combine_upright();
 
-        if writing_mode != WritingMode::HorizontalTb &&
+        if matches!(writing_mode, WritingMode::VerticalRl | WritingMode::VerticalLr) &&
             text_combine_upright == TextCombineUpright::All
         {
             self.style.add_flags(ComputedValueFlags::IS_TEXT_COMBINED);