[DevTools] Fix GlassPane choosing anchor side.

third_party/WebKit/Source/devtools/front_end/ui/GlassPane.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 UI.GlassPane = class {
   /**
    * @param {!Document} document
    * @param {boolean} dimmed
    * @param {boolean} blockPointerEvents
    * @param {function(!Event)} onClickOutside
@@ skipping 111 matching lines @@
       height = Math.min(height, this._maxSize.height);
     }
 
     if (this._anchorBox) {
       var anchorBox = this._anchorBox.relativeToElement(container);
       var behavior = this._anchorBehavior;
 
       if (behavior === UI.GlassPane.AnchorBehavior.PreferTop || behavior === UI.GlassPane.AnchorBehavior.PreferBottom) {
         var top = anchorBox.y - gutterSize;
         var bottom = containerHeight - anchorBox.y - anchorBox.height - gutterSize;
-        if (behavior === UI.GlassPane.AnchorBehavior.PreferTop && top < height && bottom >= height)
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferTop && top < height && bottom > top)
           behavior = UI.GlassPane.AnchorBehavior.PreferBottom;
-        if (behavior === UI.GlassPane.AnchorBehavior.PreferBottom && bottom < height && top >= height)
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferBottom && bottom < height && top > bottom)
           behavior = UI.GlassPane.AnchorBehavior.PreferTop;
 
         positionX = Math.max(gutterSize, Math.min(anchorBox.x, containerWidth - width - gutterSize));
         width = Math.min(width, containerWidth - positionX - gutterSize);
         if (behavior === UI.GlassPane.AnchorBehavior.PreferTop) {
           positionY = Math.max(gutterSize, anchorBox.y - height);
           height = Math.min(height, anchorBox.y - positionY);
         } else {
           positionY = anchorBox.y + anchorBox.height;
           height = Math.min(height, containerHeight - positionY - gutterSize);
         }
       } else {
         var left = anchorBox.x - gutterSize;
         var right = containerWidth - anchorBox.x - anchorBox.width - gutterSize;
-        if (behavior === UI.GlassPane.AnchorBehavior.PreferLeft && left < width && right >= width)
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferLeft && left < width && right > left)
           behavior = UI.GlassPane.AnchorBehavior.PreferRight;
-        if (behavior === UI.GlassPane.AnchorBehavior.PreferRight && right < width && left >= width)
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferRight && right < width && left > right)
           behavior = UI.GlassPane.AnchorBehavior.PreferLeft;
 
         positionY = Math.max(gutterSize, Math.min(anchorBox.y, containerHeight - height - gutterSize));
         height = Math.min(height, containerHeight - positionY - gutterSize);
         if (behavior === UI.GlassPane.AnchorBehavior.PreferLeft) {
           positionX = Math.max(gutterSize, anchorBox.x - width);
           width = Math.min(width, anchorBox.x - positionX);
         } else {
           positionX = anchorBox.x + anchorBox.width;
           width = Math.min(width, containerWidth - positionX - gutterSize);
@@ skipping 48 matching lines @@
   PreferTop: Symbol('PreferTop'),
   PreferBottom: Symbol('PreferBottom'),
   PreferLeft: Symbol('PreferLeft'),
   PreferRight: Symbol('PreferRight'),
 };
 
 /** @type {!Map<!Document, !Element>} */
 UI.GlassPane._containers = new Map();
 /** @type {!Set<!UI.GlassPane>} */
 UI.GlassPane._panes = new Set();