From 8b45ff83e2efe0929fbe14f9ab909ab308a9ea0c Mon Sep 17 00:00:00 2001
From: reuk <reuk@users.noreply.github.com>
Date: Thu, 16 Sep 2021 11:21:12 +0100
Subject: [PATCH] Windowing:  Ignore suggested window sizes for windows that
 should not be DPI aware

---
 modules/juce_gui_basics/native/juce_win32_Windowing.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/juce_gui_basics/native/juce_win32_Windowing.cpp b/modules/juce_gui_basics/native/juce_win32_Windowing.cpp
index 8be4b61818..70276270b3 100644
--- a/modules/juce_gui_basics/native/juce_win32_Windowing.cpp
+++ b/modules/juce_gui_basics/native/juce_win32_Windowing.cpp
@@ -3370,6 +3370,12 @@ private:
 
     LRESULT handleDPIChanging (int newDPI, RECT newRect)
     {
+        // Sometimes, windows that should not be automatically scaled (secondary windows in plugins)
+        // are sent WM_DPICHANGED. The size suggested by the OS is incorrect for our unscaled
+        // window, so we should ignore it.
+        if (! isPerMonitorDPIAwareWindow (hwnd))
+            return 0;
+
         const auto newScale = (double) newDPI / USER_DEFAULT_SCREEN_DPI;
 
         if (approximatelyEqual (scaleFactor, newScale))