[Bug 50339] New: MUSICUS!: taps on touch screen do not register as clicks

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50339

Bug ID: 50339
           Summary: MUSICUS!: taps on touch screen do not register as
                    clicks
           Product: Wine-staging
           Version: 6.0-rc2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail]
      Distribution: ---

There is a free demo version that can be downloaded here:
https://musicus.over-drive.jp/trial/ [click the link saying ”ダウンロード版”, in
green]; it's affected just like the full version. Setting the locale to
ja_JP.UTF-8 is required for the Japanese text to display properly, but that's
irrelevant for testing this bug.

The game runs flawlessly, except when using wine-staging taps on a touchscreen
[specifically a Surface Go 2] will not register as left mouse-clicks, they'll
just move the pointer. On-hover events work as normal, e.g. menu items will
highlight, there's just no way to actually send a click.

Wine-devel is fine; the touchpad on the Type Cover works on either version;
Wayland/X11 doesn't make a difference; nor does configuring a virtual desktop.
It's definitely something in staging.

For the record I'm using the official winehq.org packages on Ubuntu 20.04.