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This reverts commit b56b23007664525e13f7f7ec50a9a6adff0bdfd9. which somehow made us miss repaints on uvar notifications. The commit was a workaround for a polling bug which was later properly fixed by 7c5b8b855 ("Use the uvar notifier pipe timestamp to avoid excessive polling"), so it's no longer necessary. Add a system test. If I had a better understanding of the bug I could probably write a better test. Fixes #8088