зеркало из https://github.com/mozilla/gecko-dev.git
43ec533571
`appearance` CSS rules allow elements to take on system appearance. For UI elements that we want to take on system styling, we set `appearance: auto` combined with platform-specific rules like `-moz-default-appearance: -moz-mac-vibrant-titlebar-light;`
macOS sidebar vibrancy broke because a background-color was being applied to `root`. That colour appeared under elements with `appearance: auto` set, so we wouldn't see the platform-specific styling. This patch moves the root background-color to `#navigator-toolbox`, so that it does not appear under `#sidebar-box`.
We still want a background colour applied to sidebars when a lwtheme includes one. We only want `appearance: auto` applied to sidebars when the active theme does not have sidebar styling rules. That's why `#sidebar-box:not(:-moz-lwtheme)` is changed to `#sidebar-box:not([lwt-sidebar])`.
This patch also removes the rule
```
:root:-moz-lwtheme {
appearance: none;
}
```
from osx/global/global.css. There's no corresponding addition of a `#navigator-toolbox { appearance:none; }` rule because that rule already exists in [osx/browser.css](https://searchfox.org/mozilla-central/rev/7067bbd8194f4346ec59d77c33cd88f06763e090/browser/themes/osx/browser.css#45).
Differential Revision: https://phabricator.services.mozilla.com/D104416
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