Bug 1535437 - Part 1: Allow windows to resize outside of aspect ratio locking on Windows r=jmathies

Differential Revision: https://phabricator.services.mozilla.com/D51940

--HG--
extra : moz-landing-system : lando

widget/windows/nsWindow.cpp

@@ -1864,8 +1864,10 @@ void nsWindow::Resize(double aWidth, double aHeight, bool aRepaint) {
 
     ClearThemeRegion();
     double oldScale = mDefaultScale;
+    mResizeState = RESIZING;
     VERIFY(
         ::SetWindowPos(mWnd, nullptr, 0, 0, width, GetHeight(height), flags));
+    mResizeState = NOT_RESIZING;
     if (WinUtils::LogToPhysFactor(mWnd) != oldScale) {
       ChangedDPI();
     }
@@ -1913,8 +1915,10 @@ void nsWindow::Resize(double aX, double aY, double aWidth, double aHeight,
 
     ClearThemeRegion();
     double oldScale = mDefaultScale;
+    mResizeState = RESIZING;
     VERIFY(
         ::SetWindowPos(mWnd, nullptr, x, y, width, GetHeight(height), flags));
+    mResizeState = NOT_RESIZING;
     if (WinUtils::LogToPhysFactor(mWnd) != oldScale) {
       ChangedDPI();
     }