From e41856f25c7c4288f4d4606570e90189a200a38e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Fri, 18 Nov 2022 16:58:26 +0000
Subject: [PATCH] Bug 1801138 - Ensure empty label values don't collapse. r=dao

Add a zwsp character to ensure they're not considered an empty line.

Differential Revision: https://phabricator.services.mozilla.com/D162301
---
 toolkit/content/xul.css | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/toolkit/content/xul.css b/toolkit/content/xul.css
index 78d27fcf768d..eb82572c36ed 100644
--- a/toolkit/content/xul.css
+++ b/toolkit/content/xul.css
@@ -167,6 +167,10 @@ description[value]::before {
   display: block;
 }
 
+label[value=""]::before {
+  content: "\200B"; /* zwsp */
+}
+
 label[value][crop]::before,
 description[value][crop]::before {
   min-width: 0;