Emilio Cobos Alvarez f80600c6d2 Bug 1708735 - Make the arrowpanel code more generic. r=dao,zombie
Share the concept of a panel content with all other menupopups / panels.

This avoids importing global.css in the shadow tree, and renames the
arrowcontent part to just "content", since we want to introduce a
"content" part for other panels.

This shouldn't change behavior but makes bug 1708136 a matter of
tweaking a couple CSS rules and fixing up test failures.

Differential Revision: https://phabricator.services.mozilla.com/D113990
2021-05-30 12:31:49 +00:00
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