Bug 1457189 - Dispatch the resolutionchange event when changing the display resolution even if DPI remains the same. r=jimm

MozReview-Commit-ID: A0thvn5bBDy

--HG--
extra : rebase_source : 50795a1b7f7704b0cb636faf2f60acd89ea5bfab

widget/windows/nsWindow.cpp

@@ -5919,6 +5919,9 @@ nsWindow::ProcessMessage(UINT msg, WPARAM& wParam, LPARAM& lParam,
     case WM_DISPLAYCHANGE:
     {
       ScreenHelperWin::RefreshScreens();
+      if (mWidgetListener) {
+        mWidgetListener->UIResolutionChanged();
+      }
       break;
     }
 

widget/windows/nsWindowBase.cpp

@@ -121,7 +121,6 @@ void nsWindowBase::ChangedDPI()
     if (presShell) {
       presShell->BackingScaleFactorChanged();
     }
-    mWidgetListener->UIResolutionChanged();
   }
 }