[Bug 59595] New: wineboot --init hangs indefinitely during prefix creation on macOS 26 (Tahoe)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59595

            Bug ID: 59595
           Summary: wineboot --init hangs indefinitely during prefix
                    creation on macOS 26 (Tahoe)
           Product: Wine
           Version: 11.5
          Hardware: aarch64
                OS: MacOS
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winemac.drv
          Assignee: [e-mail]
          Reporter: [e-mail]

Created attachment 80664
  --> http://bugs.winehq.org/attachment.cgi?id=80664
my fix

Running `wineboot --init` to create a new prefix hangs indefinitely on macOS 26
(Tahoe). The process never completes and must be killed manually.

The hang occurs during the `rundll32 setupapi,InstallHinfSection` step. Despite
the fix in commit b3291a27544 (bug #58915), the issue persists on macOS 26.

## Root Cause

rundll32.c creates its window with `WS_VISIBLE` style (line 274):

```c
hWnd = CreateWindowW(L"class_rundll32", L"rundll32",
WS_OVERLAPPEDWINDOW|WS_VISIBLE,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, NULL, NULL);
```

On macOS 26, creating a visible window triggers this chain:
1. `CreateWindowW` with `WS_VISIBLE` → winemac.drv shows the window
2. `cocoa_window.m:1740` calls `transformProcessToForeground`
3. This sets `NSApplicationActivationPolicyRegular` and activates the app
4. `applicationDidBecomeActive:` fires → calls `sendDisplaysChanged:TRUE`
5. Display-change events are posted to Wine event queues
6. winemac.drv's clipboard manager starts a 2-second `WM_TIMER`
(clipboard.c:1328)
7. The message pump inside `CreateWindowW` dispatches these events and timers
8. Processing events triggers more Cocoa activation callbacks → goto step 4

rundll32 never reaches `LoadLibraryW(szDllName)` or `InstallHinfSection`
because it's stuck in the message pump inside `CreateWindowW`.

## Evidence

WINEDEBUG trace shows rundll32 (thread 0058) entering `macdrv_ProcessEvents`
every 2 seconds and never progressing past window creation:

```
182779.011:0058:trace:event:macdrv_ProcessEvents mask 1cff
182781.011:0058:trace:event:macdrv_ProcessEvents mask 1cff
182783.011:0058:trace:event:macdrv_ProcessEvents mask 1cff
[repeats indefinitely at 2s intervals = CLIPBOARD_UPDATE_DELAY]
```

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