@Mooeypoo , do you think this is a duplicate of T165230: [regression] Refreshing the page makes filters vanish ?

(1) Regarding scenarios described - each click on a browser back button, 'rolls back' just one action performed by a user:

• a user checks (select) a filter
• a user applies highlight color to a filter

So, clicking the Back button will roll back first applied highlight, then selection of filter. Why at some point there will be no action after clicking on the button is another issue.

(2) the behavior of the browser Back button is even more puzzling on, e.g. Watchlist or Contributions page.

• land on Main page
• go to Watchlist page - change "Period of time to display" and click "Show"
• click to Hide any option - click "Show"
• click Back
• nothing will be changed in selected options, but if "No changes during the given period match these criteria." was displayed as the result of selected options, so now a use will see some results.
• click Back again - the previously hidden option becomes unhidden
• click Back again - 'Main page' will be displayed.

(2) Re-checked T165230: [regression] Refreshing the page makes filters vanish - no regression of that particular issue.

Checked as part of the checking the fix for T167919: The 'back' button should go out of RCFilters and to the previous page - the behavior of 'Back' browser button on RC page is consistent now with the expected back/forward browser navigation.

QA Recommendation: Resolve