From da7b514926db217e11fd8e9c71b36e18ba952616 Mon Sep 17 00:00:00 2001
From: Andrew Ozz <azaozz@git.wordpress.org>
Date: Tue, 12 Mar 2019 20:13:14 +0000
Subject: [PATCH] TinyMCE: fix editor height when loaded hidden.

Props nnikolov, azaozz.
Fixes #45461.

git-svn-id: https://develop.svn.wordpress.org/trunk@44832 602fd350-edb4-49c9-b593-d223f7449a82
---
 .../vendor/tinymce/plugins/wordpress/plugin.js   | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/js/_enqueues/vendor/tinymce/plugins/wordpress/plugin.js b/src/js/_enqueues/vendor/tinymce/plugins/wordpress/plugin.js
index 3f2cf567ac..95d462d115 100644
--- a/src/js/_enqueues/vendor/tinymce/plugins/wordpress/plugin.js
+++ b/src/js/_enqueues/vendor/tinymce/plugins/wordpress/plugin.js
@@ -19,7 +19,7 @@ tinymce.PluginManager.add( 'wordpress', function( editor ) {
 	}
 
 	function toggleToolbars( state ) {
-		var initial, toolbars,
+		var initial, toolbars, iframeHeight,
 			pixels = 0,
 			classicBlockToolbar = tinymce.$( '.block-library-classic__toolbar' );
 
@@ -44,18 +44,24 @@ tinymce.PluginManager.add( 'wordpress', function( editor ) {
 				if ( i > 0 ) {
 					if ( state === 'hide' ) {
 						toolbar.hide();
-						pixels += 30;
+						pixels += 34;
 					} else {
 						toolbar.show();
-						pixels -= 30;
+						pixels -= 34;
 					}
 				}
 			});
 		}
 
 		// Resize editor iframe, not needed for iOS and inline instances.
-		if ( pixels && ! tinymce.Env.iOS && editor.iframeElement ) {
-			DOM.setStyle( editor.iframeElement, 'height', editor.iframeElement.clientHeight + pixels );
+		// Don't resize if the editor is in a hidden container.
+		if ( pixels && ! tinymce.Env.iOS && editor.iframeElement && editor.iframeElement.clientHeight ) {
+			iframeHeight = editor.iframeElement.clientHeight + pixels;
+
+			// Keep min-height.
+			if ( iframeHeight > 50  ) {
+				DOM.setStyle( editor.iframeElement, 'height', iframeHeight );
+			}
 		}
 
 		if ( ! initial ) {