Merge "Improve page scrolling performance part 2"
diff --git a/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js b/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js
index 4d53631..04d8b6e 100644
--- a/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js
+++ b/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js
@@ -51,7 +51,6 @@
 
     detached() {
       this._handleHideTooltip();
-      this.unlisten(window, 'scroll', '_handleWindowScroll');
     },
 
     _setupTooltipListeners() {
@@ -59,9 +58,6 @@
       this._hasSetupTooltipListeners = true;
 
       this.addEventListener('mouseenter', this._handleShowTooltip.bind(this));
-      this.addEventListener('mouseleave', this._handleHideTooltip.bind(this));
-      this.addEventListener('tap', this._handleHideTooltip.bind(this));
-      this.listen(window, 'scroll', '_handleWindowScroll');
     },
 
     _handleShowTooltip(e) {
@@ -91,6 +87,9 @@
       tooltip.style.visibility = null;
 
       this._tooltip = tooltip;
+      this.listen(window, 'scroll', '_handleWindowScroll');
+      this.listen(this, 'mouseleave', '_handleHideTooltip');
+      this.listen(this, 'tap', '_handleHideTooltip');
     },
 
     _handleHideTooltip(e) {
@@ -100,6 +99,9 @@
         return;
       }
 
+      this.unlisten(window, 'scroll', '_handleWindowScroll');
+      this.unlisten(this, 'mouseleave', '_handleHideTooltip');
+      this.unlisten(this, 'tap', '_handleHideTooltip');
       this.setAttribute('title', this._titleText);
       if (this._tooltip && this._tooltip.parentNode) {
         this._tooltip.parentNode.removeChild(this._tooltip);
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 81c6d99..540df98 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -108,7 +108,6 @@
         cursor: pointer;
       }
       .content {
-        overflow: hidden;
         /* Set min width since setting width on table cells still
            allows them to shrink. Do not set max width because
            CJK (Chinese-Japanese-Korean) glyphs have variable width */