Use editor's title for new preview window

CHANGES.md

@@ -20,7 +20,7 @@ New Features:
 * [#4807](/~https://github.com/ckeditor/ckeditor4/issues/4807): [Chrome] Improve the performance of pasting large images. Thanks to [FlowIT-JIT](/~https://github.com/FlowIT-JIT)!
 * [#4850](/~https://github.com/ckeditor/ckeditor4/issues/4850): Added support for loading [content templates](https://ckeditor.com/cke4/addon/templates) from HTML files. Thanks to [Fynn96](/~https://github.com/Fynn96)!
 * [#4874](/~https://github.com/ckeditor/ckeditor4/issues/4874): Added the [`config.clipboard_handleImages`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-clipboard_handleImages) configuration option for enabling and disabling built-in support for pasting and dropping images in the [Clipboard](https://ckeditor.com/cke4/addon/clipboard) plugin. Thanks to [FlowIT-JIT](/~https://github.com/FlowIT-JIT)!
-* [#4858](/~https://github.com/ckeditor/ckeditor4/issues/4858): Fixed: [Autolink](https://ckeditor.com/cke4/addon/autolink) plugin incorrectly escapes `&` characters when pasting links into the editor.
+* [#4026](/~https://github.com/ckeditor/ckeditor4/issues/4026): [Preview](https://ckeditor.com/cke4/addon/preview) plugin now uses [`editor#title`](http://localhost/ckeditor4-docs/build/docs/ckeditor4/latest/api/CKEDITOR_editor.html#property-title) property for the title of the preview window. Thanks to [Ely](/~https://github.com/Elyasin)!
 
 Fixed Issues:
 
@@ -35,6 +35,7 @@ Fixed Issues:
 * [#4790](/~https://github.com/ckeditor/ckeditor4/issues/4790): Fixed: Printing page is invoked before the printed page is fully loaded.
 * [#4874](/~https://github.com/ckeditor/ckeditor4/issues/4874): Fixed: Built-in support for pasting and dropping images in the [Clipboard](https://ckeditor.com/cke4/addon/clipboard) plugin restricts third party plugins from handling image pasting. Thanks to [FlowIT-JIT](/~https://github.com/FlowIT-JIT)!
 * [#4888](/~https://github.com/ckeditor/ckeditor4/issues/4888): Fixed: [`CKEDITOR.dialog#setState()`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dialog.html#method-setState) method throws error when there is no "Ok" button in the dialog.
+* [#4858](/~https://github.com/ckeditor/ckeditor4/issues/4858): Fixed: [Autolink](https://ckeditor.com/cke4/addon/autolink) plugin incorrectly escapes `&` characters when pasting links into the editor.
 
 API Changes:
 

plugins/preview/plugin.js

@@ -115,7 +115,7 @@
 	function createPreviewHtml( editor, callback ) {
 		var pluginPath = CKEDITOR.plugins.getPath( 'preview' ),
 			config = editor.config,
-			title = editor.lang.preview.preview,
+			title = editor.title,
 			baseTag = generateBaseTag();
 
 		if ( config.fullPage ) {

tests/plugins/preview/manual/previewtitle.html

@@ -0,0 +1,13 @@
+<div id="editor">
+	<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit.</p>
+</div>
+
+<script>
+	if ( CKEDITOR.env.safari ) {
+		bender.ignore();
+	}
+
+	CKEDITOR.replace( 'editor', {
+		title: 'Some fancy title'
+	} );
+</script>

tests/plugins/preview/manual/previewtitle.md

@@ -0,0 +1,8 @@
+@bender-tags: 4.17.0, feature, 4026
+@bender-ui: collapsed
+@bender-ckeditor-plugins: wysiwygarea, preview, font, colorbutton, format, clipboard, pagebreak, toolbar, floatingspace, link, image2
+
+1. Click "Preview" button.
+2. Check the title of the newly opened window.
+
+	**Expected** Title equals "Some fancy title".

tests/plugins/preview/preview.js

@@ -6,6 +6,26 @@ bender.editor = {
 };
 
 bender.test( {
+	// (#4026)
+	'test title of preview': function() {
+		var tc = this,
+			editor = tc.editor;
+
+		editor.title = 'Test title';
+		editor.once( 'contentPreview', function( event ) {
+			event.cancel();
+
+			tc.resume( function() {
+				assert.isMatching( '<title>' + editor.title + '</title>', event.data.dataValue,
+					'Preview title is editor\'s title.' );
+			} );
+		}, null, null, 1 );
+
+		editor.execCommand( 'preview' );
+
+		tc.wait();
+	},
+
 	'test processing of data on contentPreview': function() {
 		var tc = this,
 			editor = tc.editor;