This patch adjusts the method which marks CSS declarations as overridden to also consider pseudo-elements when they're not directly selected (i.e. their host element is selected).
For style rules on regular elements, there's a condition to only consider rules that match the selected element. This is done so that unmatched rules (you may get one after renaming a selector in the Rules view) don't influence the remaining matching rules. For pseudo-elements, this strict check caused pseudo-element rules to not show overridden declarations if they weren't directly selected in the markup view. For some types of pseudo-elements, it is impossible to ever select their nodes in the markup view because they don't exist, for example ::first-line, ::selection, ::first-letter, etc.
Also introduced an optimization to not call the logic to mark declarations as overridden for non-existent pseudo-elements. The previous code ran a minimum of 17 times, once for every entry in `cssProperties.pseudoElements` array which includes the full dictionary of pseudo-elements supported by Firefox.
Differential Revision: https://phabricator.services.mozilla.com/D32760
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extra : moz-landing-system : lando
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