Fix ARM64EC build failures: LNK4279 POINT icall thunk mismatch with MFC

[Copilot]

ARM64EC builds (Debug_Unicode and Release_Unicode) fail at link time because MSVC 14.51 (VS 18) changed how it classifies the POINT struct in ARM64EC icall thunks (i8 — integer register) while the pre-built MFC libraries (uafxcwd.lib, uafxcw.lib) were compiled with an older ABI that emits m8 (struct/memory) thunks for the same functions. Since /WX is set, LNK4279 is promoted to LNK1218 (fatal error).

Affected imported functions:

• PtInRect — Dialog.obj vs uafxcwd.lib(wincore.obj) (Debug)
• WindowFromPoint — LTCG CIL module vs uafxcw.lib(afxbutton.obj) (Release)

Changes

• UI/Dialogs/Dialog.cpp — Replace the three PtInRect() calls with an inline lambda, removing the imported-function reference from Dialog.obj entirely:

  const auto ptInRect = [](const RECT& rc, POINT p) noexcept {
      return p.x >= rc.left && p.x < rc.right && p.y >= rc.top && p.y < rc.bottom;
  };
  if (ptInRect(rcCloseIcon, pt)) ret = HTCLOSE;

• Directory.Build.props — Add /IGNORE:4279 to ARM64EC linker settings to suppress the residual LNK4279 from WindowFromPoint (an OS API that can't be inlined). For a trivially-copyable 8-byte struct like POINT, both i8 and m8 thunks produce equivalent code, so this is a safe suppression scoped only to ARM64EC.

  <ItemDefinitionGroup Condition="'$(Platform)' == 'ARM64EC'">
    <Link>
      <AdditionalOptions>/IGNORE:4279 %(AdditionalOptions)</AdditionalOptions>
    </Link>
  </ItemDefinitionGroup>

[github-actions]

Test Results

    8 files  ±0      8 suites  ±0   46s ⏱️ -7s
  251 tests ±0    251 ✅ ±0  0 💤 ±0  0 ❌ ±0 
2 008 runs  ±0  2 008 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 1d86955. ± Comparison against base commit a12e399.