Group and scope the secondary toolbar rules using CSS nesting #18597
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The secondary toolbar CSS rules predate the general availability of CSS nesting, which makes them more difficult to understand and change safely. The primary issues are that the rules are spread over the
viewer.css
file, they share blocks with other elements and the scope of the rules is sometimes bigger than necessary.This refactoring groups all remaining secondary toolbar rules together, scoped to the top-level
#secondaryToolbar
element, for improved overview and isolation. Note that this patch only intends to move the existing rules around and not change any behavior.Notes for the reviewer:
#secondaryToolbar
element and noticing that the rules in this block are already inactive:Extracts a part of #18385.