From 6f856ce495872bb202be03c056fdbcd13ec162f3 Mon Sep 17 00:00:00 2001
From: Ilya Fedin <fedin-ilja2010@ya.ru>
Date: Sat, 18 Jun 2022 08:37:54 +0400
Subject: [PATCH] Use ScreenToClient for point convertion in WM_NCHITTEST

---
 ui/platform/win/ui_window_win.cpp | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/ui/platform/win/ui_window_win.cpp b/ui/platform/win/ui_window_win.cpp
index 89c2793..1f02692 100644
--- a/ui/platform/win/ui_window_win.cpp
+++ b/ui/platform/win/ui_window_win.cpp
@@ -24,6 +24,7 @@
 
 #include <dwmapi.h>
 #include <uxtheme.h>
+#include <windowsx.h>
 
 Q_DECLARE_METATYPE(QMargins);
 
@@ -513,12 +514,9 @@ bool WindowHelper::handleNativeEvent(
 			return false;
 		}
 
-		const auto p = MAKEPOINTS(lParam);
-		auto r = RECT();
-		GetWindowRect(_handle, &r);
-		const auto mapped = QPoint(
-			p.x - r.left + _marginsDelta.left(),
-			p.y - r.top + _marginsDelta.top());
+		POINT p{ GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
+		ScreenToClient(_handle, &p);
+		const auto mapped = QPoint(p.x, p.y) / window()->devicePixelRatioF();
 		*result = [&] {
 			if (!window()->rect().contains(mapped)) {
 				return HTTRANSPARENT;