Bug 1412608 - Fix comment selection color in markup view. r=jdescottes

MozReview-Commit-ID: 9G5efQSPHCf

--HG--
extra : rebase_source : 66daf5352bacc1f2479d7e67dc1341c9ca049822

devtools/client/themes/markup.css

@@ -387,6 +387,7 @@ ul.children + .tag-line::before {
    theme-selected doesn't work in this case since the text is a
    sibling of the class, not a child. */
 .theme-selected ~ .editor,
+.theme-selected ~ .editor.comment,
 .theme-selected ~ .editor .theme-fg-color1,
 .theme-selected ~ .editor .theme-fg-color2,
 .theme-selected ~ .editor .theme-fg-color3,