With this series it's now possible to run and pass `user32:monitor` and `user32:sysparams` tests with nulldrv, and so most `user32` tests (except for a few desktop cursor position tests). This still requires some prefix configuration to enable the nulldrv driver, or a change like https://gitlab.winehq.org/rbernon/wine/-/commit/753368ad0ec52f03f8d6e78ca794... to enable it when `DISPLAY` environment variable is unset.
This then shows that some of the user32 tests are failing with winex11 but passing with nulldrv, as in https://gitlab.winehq.org/rbernon/wine/-/commit/6d5f4109a514a0dc266899fcacfa....
-- v3: win32u: Return DISP_CHANGE_SUCCESSFUL from nulldrv_ChangeDisplaySettingsEx. win32u: Read current display settings from the registry if GetCurrentDisplaySettings fails. win32u: Write current display settings to the registry in apply_display_settings. win32u: Force update display cache after NtUserChangeDisplaySettingsEx. win32u: Introduce a new VirtualScreenRectChanged display driver callback. win32u: Broadcast WM_DISPLAYCHANGE message on display settings change. win32u: Move enumeration of available modes out of graphics drivers.