From 361db6190ee4a168d5c313fe7292418a253ab106 Mon Sep 17 00:00:00 2001
From: Guillermo Rauch <rauchg@gmail.com>
Date: Sat, 18 Feb 2017 00:27:29 -0300
Subject: [PATCH] avoid layout recalculation upon scrollport resize

---
 lib/hterm.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/hterm.js b/lib/hterm.js
index 66480135..442c21dc 100644
--- a/lib/hterm.js
+++ b/lib/hterm.js
@@ -324,6 +324,25 @@ hterm.Terminal.prototype.onMouseDown_ = function (e) {
   }
 };
 
+// override `ScrollPort.resize` to avoid an expensive calculation
+// just to get the size of the scrollbar, which for Hyper is always
+// set to overlay (hence with `0`)
+hterm.ScrollPort.prototype.resize = function () {
+  this.currentScrollbarWidthPx = 0;
+
+  this.syncScrollHeight();
+  this.syncRowNodesDimensions_();
+
+  this.publish(
+    'resize',
+    {scrollPort: this},
+    () => {
+      this.scrollRowToBottom(this.rowProvider_.getRowCount());
+      this.scheduleRedraw();
+    }
+  );
+};
+
 // make background transparent to avoid transparency issues
 hterm.ScrollPort.prototype.setBackgroundColor = function () {
   this.screen_.style.backgroundColor = 'transparent';