[gnome-shell/wip/carlosg/magnifier-improvements: 1/6] magnifier: Ignore repeated a11y events

[Carlos Garnacho <carlosg src gnome org>]

commit f185bf29e4e42cb2278489a86a4bdd55d2dd3125
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Feb 6 10:56:44 2020 +0100

    magnifier: Ignore repeated a11y events
    
    We may get several a11y events setting the caret on the same
    coordinates it previously was. Make focus tracking ignore those,
    as we're jumping to the same coordinates again during eg. mouse
    operation.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/984

 js/ui/magnifier.js | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)
---
diff --git a/js/ui/magnifier.js b/js/ui/magnifier.js
index 4978196409..7b43e8dd2c 100644
--- a/js/ui/magnifier.js
+++ b/js/ui/magnifier.js
@@ -799,9 +799,13 @@ var ZoomRegion = class ZoomRegion {
             return;
         }
 
-        [this._xFocus, this._yFocus] = [extents.x + (extents.width / 2),
-                                        extents.y + (extents.height / 2)];
-        this._centerFromFocusPosition();
+        let [xFocus, yFocus] = [extents.x + (extents.width / 2),
+                                extents.y + (extents.height / 2)];
+
+        if (this._xFocus !== xFocus || this._yFocus !== yFocus) {
+            [this._xFocus, this._yFocus] = [xFocus, yFocus];
+            this._centerFromFocusPosition();
+        }
     }
 
     _updateCaret(caller, event) {
@@ -816,8 +820,12 @@ var ZoomRegion = class ZoomRegion {
             return;
         }
 
-        [this._xCaret, this._yCaret] = [extents.x, extents.y];
-        this._centerFromCaretPosition();
+        let [xCaret, yCaret] = [extents.x, extents.y];
+
+        if (this._xCaret !== xCaret || this._yCaret !== yCaret) {
+            [this._xCaret, this._yCaret] = [xCaret, yCaret];
+            this._centerFromCaretPosition();
+        }
     }
 
     /**