[Bug 59089] New: Regression in 10.20 Win32u.dll causes forms in certain programs to redraw very slowly

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59089

Bug ID: 59089
           Summary: Regression in 10.20 Win32u.dll causes forms in certain
                    programs to redraw very slowly
           Product: Wine
           Version: 10.20
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: win32u
          Assignee: [e-mail]
          Reporter: [e-mail]
   Regression SHA1: 257364eb5f671b2fd63507373b0427b519dfa71d
      Distribution: ---

The forms of certain programs are redrawing very slowly in Wine version 10.20.
An example program can be downloaded from
https://drive.google.com/drive/folders/1X5ZwQJJP98fpQ2BJ5XB1g0XyUW6Abkyo?usp....
Download the "full" program, unzip, and execute the TotheWord,exe file. There
is no install file. This is a program that has been written in Delphi 12, and
maybe this issue only affects Delphi programs. This program is used to create
modules for a Bible program. When starting this program under 10.20, from the
time the splash window appears until the application form is fully drawn takes
about 15x longer than it does with Wine 10.19. Under the "Editor Mode"
selection in the application menu, alternately selecting "Book Editor" and
"Bible Editor" takes about five seconds on a fairly powerful computer for the
respective forms to be fully drawn. In 10.19, this is nearly instantaneous. A
significant lag also occurs when switching between some of the tabs in the
form.

I am almost certain that this regression has been caused by the commit titled
"win32u: Update client surfaces starting from toplevel window." I don't have
the expertise to revert this commit without causing a compile failure, but
replacing the win32u.so file in the 10.20 build with the one from the 10.19
build does completely resolve this issue.

[Bug 59089] Forms in certain programs redraw very slowly

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59089

Gijs Vermeulen  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |regression
            Summary|Regression in 10.20         |Forms in certain programs
                   |Win32u.dll causes forms in  |redraw very slowly
                   |certain programs to redraw  |
                   |very slowly                 |