From ad760fec6c20383b9fd75495ffb5b4f600b3d82b Mon Sep 17 00:00:00 2001
From: Nathan Reese <reese.nathan@gmail.com>
Date: Fri, 25 Aug 2017 12:32:24 -0600
Subject: [PATCH] Keep current cursor or top line in view when resizing Console
 to avoid losing user context (#13695)

* keep current cursor or top line in view when resizing to avoid losing user context

* rename variable to more descriptive name

* move state from editor to smart_resize
---
 .../console/public/src/input_resize.js           |  2 ++
 .../console/public/src/smart_resize.js           | 16 +++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/core_plugins/console/public/src/input_resize.js b/src/core_plugins/console/public/src/input_resize.js
index 237ff81039e763..f11e59c37d077e 100644
--- a/src/core_plugins/console/public/src/input_resize.js
+++ b/src/core_plugins/console/public/src/input_resize.js
@@ -24,6 +24,8 @@ module.exports = function (input, output) {
       $resizer.addClass('active');
       var startWidth = $left.width();
       var startX = event.pageX;
+      input.resize.topRow = input.renderer.layerConfig.firstRow;
+      output.resize.topRow = output.renderer.layerConfig.firstRow;
 
       function onMove(event) {
         setEditorWidth(startWidth + event.pageX - startX)
diff --git a/src/core_plugins/console/public/src/smart_resize.js b/src/core_plugins/console/public/src/smart_resize.js
index 5f943d1579e140..49724cb9a5f8a6 100644
--- a/src/core_plugins/console/public/src/smart_resize.js
+++ b/src/core_plugins/console/public/src/smart_resize.js
@@ -1,6 +1,16 @@
-import { throttle } from 'lodash';
+import { get, throttle } from 'lodash';
 
 module.exports = function (editor) {
   const resize = editor.resize;
-  return throttle(() => resize.call(editor), 35)
-};
+  const throttledResize = throttle(() => {
+
+    resize.call(editor);
+
+    // Keep current top line in view when resizing to avoid losing user context
+    let userRow = get(throttledResize, 'topRow', 0);
+    if (userRow !== 0) {
+      editor.renderer.scrollToLine(userRow, false, false, () => {});
+    }
+  }, 35);
+  return throttledResize;
+}