Bug 1646222 - Don't invalidate vector images as a result of size/display mode changes. r=tnikkel

sizemode/displaymode media queries only affect a given browsing context
tree so there's no need to propagate the change to images in that case.

Differential Revision: https://phabricator.services.mozilla.com/D94422

docshell/base/nsDocShell.cpp

@@ -3227,7 +3227,8 @@ nsDocShell::SetDeviceSizeIsPageSize(bool aValue) {
     RefPtr<nsPresContext> presContext = GetPresContext();
     if (presContext) {
       presContext->MediaFeatureValuesChanged(
-          {MediaFeatureChangeReason::DeviceSizeIsPageSizeChange});
+          {MediaFeatureChangeReason::DeviceSizeIsPageSizeChange},
+          MediaFeatureChangePropagation::JustThisDocument);
     }
   }
   return NS_OK;