This series tries to fix WM_PASTE tests error on edit control (both user32 & comctl32).
The test failures where systematic on a local Win10 for comctl32 (yet very rare on user32, perhaps one in 20 runs).
Since the failures are not systematic, it ought to be a synchronisation / timing issue.
Flushing the msg queue before starting the paste test cycle seems to fix the issue. - 0 occurence on comctl32 and user32 in 50 run (local VM) - 0 occurence on Testbot (comctl32) in 1 run.
It's hard to be fully conclusive about bug resolution, but it's at least a step into the right direction.
-- v4: comctl32/tests: Fix failing WM_PASTE tests for edit control on Win10+. comctl32/tests: Retry when opening the clipboard. user32/tests: Fix failing WM_PASTE tests for edit control on Win10+. user32/tests: Retry when opening the clipboard.