Fix or remove dead CSS in toolbar.module.css

Problem/Motivation

core/modules/toolbar/css/toolbar.module.css contains this line:

.toolar .toolbar-tray > .toolbar-lining {

Emphasis on the "toolar".

Proposed resolution

This line was introduced as .toolar .tray .lining in #1137920: Fix toolbar on small screen sizes and redesign toolbar for desktop and was initially committed in November 2012. It can probably be removed, but we might as well see if it's doing anything I suppose :)

The line was changed most recently in #1938044: Prefix all toolbar classes to prevent theme clashes and then earlier in #1847314: Reduce the dependency on JavaScript for the toolbar to display properly (thanks recursive-blame)

Remaining tasks

• Patch
• Review
• Screenshots potentially

User interface changes

TBD

API changes

n/a