[Bug 48174] New: wine-mono creates incorrect strings

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48174

            Bug ID: 48174
           Summary: wine-mono creates incorrect strings
           Product: Wine
           Version: 4.20
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: mscoree
          Assignee: wine-bugs at winehq.org
          Reporter: galtgendo at o2.pl
      Distribution: ---

This bug is about Smile Game Builder - a game engine.
As a testcase 「虚毒ノ夢」 will be used - a (it seems - I don't actually know
Japanese) freeware game available from
https://kanawo.wixsite.com/teritoma/kodoku  (first link is the download:
https://www.freem.ne.jp/dl/win/15104).

Problem 1.

As you might notice, the window title is purely mojibake.
CreateWindowEx expects CP_ACP string in cs->lpszName, but it's getting an utf8
one.
That's pretty much sums up what I could figure out about this part.

Problem 2.

This one is more tricky to notice; also, I couldn't figure out much about it,
so just describing symptoms.
Some of the strings printed on the screen (AFAICT neither by gdi, gdiplus nor
user32 standard text functions) are read from memory then written on the screen
past their actual length. What's more, they flicker - that is if such string is
printed, some of the time its extra part changes upon redraw.
As far as I understand mono (which, granted, isn't all that much), it would
suggest that upon string object creation its length is set incorrectly.

In the example game, you can observe it with a few strings as you start a new
game, then once you get control, if you walk to the closet (not the bookcase)
and interact with it, it's another such string.

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