[gnome-shell/wip/carlosg/magnifier-improvements: 5/11] magnifier: Ignore repeated a11y events

[Carlos Garnacho <carlosg src gnome org>]

commit 76833e47c370b66aec3fb909dab6972216ef2106
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..2154effc92 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();
+        }
     }
 
     /**