[css-overflow][css-contain][css-sizing] `overflow: auto` incompatible with size containment and container queries

[mozilla-apprentice]

A resolution was made for csswg-drafts/#7875.

[css-overflow][css-contain][css-sizing] `overflow: auto` incompatible with size containment and container queries

• RESOLVED: Take 2nd option (reserve space as for scrollbar-gutter) and add a new value to scrollbar-gutter for inline-axis scrollbars (tbd)

Discussion.

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