Group and scope the secondary toolbar button container/icon rules using CSS nesting #18595
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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 CSS rules for the secondary toolbar button container/icons 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. Moreover, this patch does not move the rules for the secondary toolbar itself and the secondary toolbar buttons; those will be part of a follow-up patch and will be easier once this is in place first.Notes for the reviewer:
#secondaryToolbar
rules in a different part of the file to make the diff (and future diffs for the secondary toolbar) easier. Now the deletions and additions can more easily be compared side-by-side while otherwise they would be intertwined.Extracts a part of #18385.