Re: [PATCH v3 0/2] MR2068: Draft: comdlg32: Enable visual styles when showing IFileDialog.

[Vladislav Timonin (＠vt)]

v2:
- remove `DECLSPEC_HIDDEN` from `COMDLG32_hActCtx` in `cdlg32.c`

v3:
- return `E_UNEXPECTED` if dialogue is already shown
- use `ActivateActCtx` return value to track activation state
- add activate/deactivate user activation context helpers
- and use the said helpers in events

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https://gitlab.winehq.org/wine/wine/-/merge_requests/2068#note_22665