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expected: The menu width should match the width of the Filter button
actual:
Developer notes
The element with the problem has the classes: oo-ui-widget oo-ui-widget-enabled oo-ui-selectWidget oo-ui-selectWidget-unpressed oo-ui-clippableElement-clippable oo-ui-floatableElement-floatable oo-ui-menuSelectWidget mw-rcfilters-ui-menuSelectWidget mw-rcfilters-ui-menuSelectWidget-view-namespaces
It has an inline style set including a width. The calculated width appears to be 10px too big.
Likely an issue with OOUI - "mw-rcfilters-ui-menuSelectWidget-view-namespaces" - the OOUI library sets the width and it's setting it larger than it should be. Looks like it's border box related and will likely need help from @Volker_E to fix this one.
Actual Results:
Expected Results: