[gnome-shell] magnifier: Invalidate content size when it changes

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

commit 8146e9d52701ff8e2a1851ff507b329788518769
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Mon Mar 11 16:40:45 2019 -0400

    magnifier: Invalidate content size when it changes
    
    In case the content size changes we need to invalidate its size in order to
    trigger a full actor relayout.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/443

 js/ui/magnifier.js | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/js/ui/magnifier.js b/js/ui/magnifier.js
index 3d05615ee..f6b0e9550 100644
--- a/js/ui/magnifier.js
+++ b/js/ui/magnifier.js
@@ -84,8 +84,14 @@ var MouseSpriteContent = GObject.registerClass({
         if (this._texture == coglTexture)
             return;
 
+        let oldTexture = this._texture;
         this._texture = coglTexture;
         this.invalidate();
+
+        if (!oldTexture ||
+            oldTexture.get_width() != coglTexture.get_width() ||
+            oldTexture.get_height() != coglTexture.get_height())
+            this.invalidate_size();
     }
 });