From b5da6e709d835de8920d11516143a7c01c7c2aa7 Mon Sep 17 00:00:00 2001
From: Ilya Fedin <fedin-ilja2010@ya.ru>
Date: Sat, 21 May 2022 17:10:21 +0400
Subject: [PATCH] Make window resize less lagged on Windows

---
 ui/platform/win/ui_window_win.cpp | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/ui/platform/win/ui_window_win.cpp b/ui/platform/win/ui_window_win.cpp
index 5286e27..97c38e5 100644
--- a/ui/platform/win/ui_window_win.cpp
+++ b/ui/platform/win/ui_window_win.cpp
@@ -242,6 +242,18 @@ void WindowHelper::setNativeFrame(bool enabled) {
 	updateMargins();
 	updateWindowFrameColors();
 	fixMaximizedWindow();
+	SetWindowPos(
+		_handle,
+		0,
+		0,
+		0,
+		0,
+		0,
+		SWP_FRAMECHANGED
+			| SWP_NOMOVE
+			| SWP_NOSIZE
+			| SWP_NOZORDER
+			| SWP_NOACTIVATE);
 }
 
 void WindowHelper::initialShadowUpdate() {
@@ -405,17 +417,14 @@ bool WindowHelper::handleNativeEvent(
 	} return true;
 
 	case WM_NCCALCSIZE: {
-		if (_title->isHidden()) {
+		if (_title->isHidden() || !wParam) {
 			return false;
 		}
 		WINDOWPLACEMENT wp;
 		wp.length = sizeof(WINDOWPLACEMENT);
 		if (GetWindowPlacement(_handle, &wp)
 			&& (wp.showCmd == SW_SHOWMAXIMIZED)) {
-			const auto params = (LPNCCALCSIZE_PARAMS)lParam;
-			const auto r = (wParam == TRUE)
-				? &params->rgrc[0]
-				: (LPRECT)lParam;
+			const auto r = &((LPNCCALCSIZE_PARAMS)lParam)->rgrc[0];
 			const auto hMonitor = MonitorFromPoint(
 				{ (r->left + r->right) / 2, (r->top + r->bottom) / 2 },
 				MONITOR_DEFAULTTONEAREST);
@@ -435,8 +444,10 @@ bool WindowHelper::handleNativeEvent(
 					}
 				}
 			}
+			if (result) *result = 0;
+		} else {
+			if (result) *result = WVR_REDRAW;
 		}
-		if (result) *result = 0;
 		return true;
 	}