[#842] Fix for indention list troubles

plugins/indentlist/plugin.js

@@ -175,6 +175,16 @@
 				// Make sure the newly created sublist get a brand-new element of the same type. (http://dev.ckeditor.com/ticket/5372)
 				if ( indentOffset > 0 ) {
 					var listRoot = listArray[ i ].parent;
+
+					// Find previous list item which has the same indention offset as the new indention offset
+					// of current item to copy its root tag (so the proper list-style-type is used) (#842).
+					for ( var j = i - 1; j >= 0; j-- ) {
+						if ( listArray[ j ].indent === indentOffset ) {
+							listRoot = listArray[ j ].parent;
+							break;
+						}
+					}
+
 					listArray[ i ].parent = new CKEDITOR.dom.element( listRoot.getName(), listRoot.getDocument() );
 				}
 			}

tests/plugins/indentlist/indentlist.js

@@ -0,0 +1,32 @@
+/* bender-tags: editor */
+/* bender-ckeditor-plugins: toolbar,indentlist,list,wysiwygarea */
+/* bender-ui: collapsed */
+
+( function() {
+	'use strict';
+
+	bender.editor = true;
+
+	bender.test( {
+		'test indention keeps proper list tags': function() {
+			var bot = this.editorBot;
+
+			bot.setHtmlWithSelection( '<ul><li>foo</li><li>bar<ol><li>111</li></ol><li>[222</li><li>333]</li></li><li>baz</li></ul>' );
+			bot.execCommand( 'indent' );
+
+			assert.beautified.html( '<ul><li>foo</li><li>bar<ol><li>111</li><li>222</li><li>333</li></ol></li><li>baz</li></ul>', bot.getData() );
+		},
+
+		'test outdent and indent get proper list tags': function() {
+			var bot = this.editorBot;
+
+			bot.setHtmlWithSelection( '<ol><li>foo</li><li>bar<ul><li>111</li><li>2^22</li><li>333</li></ul></li><li>baz</li></ol>' );
+
+			bot.execCommand( 'outdent' );
+			assert.beautified.html( '<ol><li>foo</li><li>bar<ul><li>111</li></ul></li><li>222<ul><li>333</li></ul></li><li>baz</li></ol>', bot.getData() );
+
+			bot.execCommand( 'indent' );
+			assert.beautified.html( '<ol><li>foo</li><li>bar<ul><li>111</li><li>222<ul><li>333</li></ul></li></ul></li><li>baz</li></ol>', bot.getData() );
+		}
+	} );
+} )();

tests/plugins/indentlist/manual/keepcorrectlisttag.html

@@ -0,0 +1,7 @@
+<textarea name="" id="editor" cols="30" rows="10">
+	<ol><li>one</li><li>two<ul><li>111</li><li>222</li><li>333</li></ul></li><li>three</li></ol>
+</textarea>
+
+<script>
+	CKEDITOR.replace( 'editor' );
+</script>

tests/plugins/indentlist/manual/keepcorrectlisttag.md

@@ -0,0 +1,14 @@
+@bender-tags: 4.8.0, 842, bug
+@bender-ui: collapsed
+@bender-ckeditor-plugins: toolbar, wysiwygarea, list, indentlist
+
+----
+
+1. Put caret in paragraph with `333`.
+1. Use `Decrease indent` button to move list item to the left.
+1. Use `Increase indent` button to move list item to the right.
+
+**Expected:** List item with `333` has circle as a list bullet.
+
+**Unexpected:** List item with `333` has number as a list bullet.
+