From 5dab6b6e61edaac32618c75bb2f6aeb5908bcda0 Mon Sep 17 00:00:00 2001
From: Gary Pendergast <gary@pento.net>
Date: Tue, 14 Nov 2017 05:19:49 +0000
Subject: [PATCH] Editor: When switching Editor tabs, don't scroll
 unnecessarily.

- When switching to the Text view, wait until after the Visual editor element has been hidden, before focussing the `<textarea>`.
- When switching to the Visual view, only scroll if the cursor is not visible on the current screen.

Fixes #42530.


Built from https://develop.svn.wordpress.org/trunk@42175


git-svn-id: http://core.svn.wordpress.org/trunk@42005 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-admin/js/editor.js     | 12 +++++++-----
 wp-admin/js/editor.min.js |  2 +-
 wp-includes/version.php   |  2 +-
 3 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/wp-admin/js/editor.js b/wp-admin/js/editor.js
index ed77d3c755..342560e2a6 100644
--- a/wp-admin/js/editor.js
+++ b/wp-admin/js/editor.js
@@ -635,6 +635,11 @@ window.wp = window.wp || {};
 				selectionPosition = TinyMCEContentAreaTop + elementTop,
 				visibleAreaHeight = windowHeight - ( edToolsHeight + toolbarHeight );
 
+			// There's no need to scroll if the selection is inside the visible area.
+			if ( selectionPosition < visibleAreaHeight ) {
+				return;
+			}
+
 			/**
 			 * The minimum scroll height should be to the top of the editor, to offer a consistent
 			 * experience.
@@ -852,19 +857,16 @@ window.wp = window.wp || {};
 				end = selection.end || selection.start;
 
 			if ( textArea.focus ) {
-				// focus and scroll to the position
+				// Wait for the Visual editor to be hidden, then focus and scroll to the position
 				setTimeout( function() {
+					textArea.setSelectionRange( start, end );
 					if ( textArea.blur ) {
 						// defocus before focusing
 						textArea.blur();
 					}
 					textArea.focus();
 				}, 100 );
-
-				textArea.focus();
 			}
-
-			textArea.setSelectionRange( start, end );
 		}
 
 		// Restore the selection when the editor is initialized. Needed when the Text editor is the default.
diff --git a/wp-admin/js/editor.min.js b/wp-admin/js/editor.min.js
index 2fb7bdca23..0a1a3cf328 100644
--- a/wp-admin/js/editor.min.js
+++ b/wp-admin/js/editor.min.js
@@ -1 +1 @@
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diff --git a/wp-includes/version.php b/wp-includes/version.php
index 1bfac09809..765c8e1730 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42173';
+$wp_version = '5.0-alpha-42175';
 
 /**
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