[gnome-shell] magnifier: Do not modify function argument

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8d6820c4df413eb51d1323a52e1d2212640777f2
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Aug 19 21:18:54 2019 +0200

    magnifier: Do not modify function argument
    
    The intention of the code is clearly to operate on a copy, but that's
    not how the Object constructor works. While it doesn't matter in
    practice that we modify the passed-in object parameter, it's still
    a good idea to fix the code.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/731

 js/ui/magnifier.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/magnifier.js b/js/ui/magnifier.js
index 73522586f3..0ec30ee00e 100644
--- a/js/ui/magnifier.js
+++ b/js/ui/magnifier.js
@@ -264,7 +264,7 @@ var Magnifier = class Magnifier {
         zoomRegion.setViewPort(viewPort);
 
         // We ignore the redundant width/height on the ROI
-        let fixedROI = new Object(roi);
+        let fixedROI = Object.create(roi);
         fixedROI.width = viewPort.width / xMagFactor;
         fixedROI.height = viewPort.height / yMagFactor;
         zoomRegion.setROI(fixedROI);