Adding unit and manual tests.

tests/plugins/indentlist/indentlist.js

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+/* 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

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+<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

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+@bender-tags: 4.7.3, 842, bug
+@bender-ui: collapsed
+@bender-ckeditor-plugins: toolbar, wysiwygarea, list, indentlist
+
+----
+
+1. Put caret in paragraph with `333`.
+1. Use `Decrease indent` to move paragraph to the left.
+1. Use `Increase indent` to move paragraph to the right.
+
+**Expected:** List item with `333` has circle as a list tag.
+
+**Unexpected:** List item with `333` has number as a list tag.
+