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-rw-r--r--win32/ScintillaWin.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/win32/ScintillaWin.cxx b/win32/ScintillaWin.cxx
index e1654fa87..82423aee3 100644
--- a/win32/ScintillaWin.cxx
+++ b/win32/ScintillaWin.cxx
@@ -2332,6 +2332,7 @@ sptr_t PASCAL ScintillaWin::CTWndProc(
sptr_t ScintillaWin::DirectFunction(
ScintillaWin *sci, UINT iMessage, uptr_t wParam, sptr_t lParam) {
+ PLATFORM_ASSERT(::GetCurrentThreadId() == ::GetWindowThreadProcessId(sci->MainHWND(), NULL));
return sci->WndProc(iMessage, wParam, lParam);
}