From 886ce572d628e7cd98cc39edcc930ffae951e95e Mon Sep 17 00:00:00 2001
From: Olivier Goffart <ogoffart@woboq.com>
Date: Wed, 22 Feb 2017 17:06:23 +0100
Subject: Windows QPA: don't resize fixed sized windows when changing screen

This seems to give pretty good result when EnableHighDPIScaling is NOT set.
But this seems to be worse when it's set.

Task-number: QTBUG-58959
Change-Id: I8de5a6c3c8b6146b1cb8f89676463206af404083
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Anton Kudryavtsev <antkudr@mail.ru>
---
 src/plugins/platforms/windows/qwindowscontext.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp
index b7a866679f..ff4ab1accb 100644
--- a/src/plugins/platforms/windows/qwindowscontext.cpp
+++ b/src/plugins/platforms/windows/qwindowscontext.cpp
@@ -1104,6 +1104,9 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
 #endif
     }   break;
     case QtWindows::DpiChangedEvent: {
+        if (GetWindowLongPtr(hwnd, GWL_STYLE) & WS_DLGFRAME)
+            return false; // Fixed-size window should not be resized
+
         platformWindow->setFlag(QWindowsWindow::WithinDpiChanged);
         const RECT *prcNewWindow = reinterpret_cast<RECT *>(lParam);
         SetWindowPos(hwnd, NULL, prcNewWindow->left, prcNewWindow->top,
-- 
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