[Bug 58073] New: Pager: Incorrect PGM_RECALCSIZE behaviour

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=58073

Bug ID: 58073
           Summary: Pager: Incorrect PGM_RECALCSIZE behaviour
           Product: Wine
           Version: 10.5
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: comctl32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 78327
  --> https://bugs.winehq.org/attachment.cgi?id=78327
Win11 Correct rendering

See https://jira.reactos.org/browse/CORE-7017

App tested: https://github.com/katahiromz/BeginBar/releases/tag/1.0
Code of the app: https://github.com/katahiromz/BeginBar

After installing, run the app, it will create a Taskbar. It begins in
"Horizontal" mode.
Right click on it, change it to "Vertical" mode.
In Windows, changing to "Vertical" mode means that the Taskbar has now a width
equal to button "Begin" width and a new height based on Desktop height.
In Ubuntu/Wine, when changing to "Vertical" mode a problem happens:
1)The new width is equal to the Horizontal width. -->Bug
2)The height is correctly calculated. --->Correct

Proposal fix: https://github.com/reactos/reactos/pull/7875