In the Messages View I change the filters and select to view Warnings as well as Errors and Critical Warnings.
When Synthesis (or another process) fails, a dialog box appears asking whether to View Messages.
When I click OK and the Messages View is displayed, it does not show warnings and the warnings tick box is unticked.
Why is my previous filter selection not remembered?
The Messages View does remember previous filter selections.
However, when coming to the Messages View through the "Synthesis Failed" dialog, there is an additional filter which only shows Errors and Critical Warnings.
As a result it only shows a filter selection of those two but not warnings.