[PATCH 0/1] MR3969: user32/tests: Use open_clipboard helper in msg tests.

[Esme Povirk (＠madewokherd)]

Copied from the clipboard tests.

This came up in a gitlab CI run: http://test.winehq.org/data/a2c552f723a3aa65eca6e518266c8b9bde4e7176/win21H2...