Manual tests.

tests/plugins/a11yhelp/manual/commandstable.html

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+<textarea id="editor1">
+    <h1>Hello world!</h1>
+    <p>I&#39;m an instance of <a href="http://ckeditor.com">CKEditor</a>.</p>
+</textarea>
+
+<button onclick="addCommands();" >Re-create editor</button>
+
+<script>
+	if ( bender.tools.env.mobile ) {
+		bender.ignore();
+	}
+
+	var editor = CKEDITOR.replace( 'editor1' );
+
+
+	function addCommands() {
+		editor.destroy();
+		editor =CKEDITOR.replace( 'editor1' );
+
+		editor.addCommand( 'extra1', {
+			exec: function() {},
+			label: 'Extra command 1'
+		} );
+		editor.addCommand( 'extra2', {
+			exec: function() {},
+			label: 'Extra command 2',
+			description: 'This command contains some description.'
+		} );
+		editor.addCommand( 'extra3', {
+			exec: function() {},
+			label: 'Extra command 3',
+		} );
+
+		editor.setKeystroke( CKEDITOR.SHIFT + CKEDITOR.ALT + 65, 'extra1' );
+		editor.setKeystroke( CKEDITOR.SHIFT + CKEDITOR.ALT + 66, 'extra2' );
+		editor.setKeystroke( CKEDITOR.SHIFT + CKEDITOR.ALT + 67, 'extra3' );
+
+		editor.on( 'keystrokeEntry', function( evt ) {
+			if ( evt.data.commandName === 'extra3' ) {
+				evt.data.label = 'This label was modified by event.'
+			}
+		} );
+	}
+</script>
+

tests/plugins/a11yhelp/manual/commandstable.md

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+@bender-tags: manual, 456, tc, 4.8.0, feature
+@bender-ui: collapsed
+@bender-ckeditor-plugins: wysiwygarea,a11yhelp
+
+1. Focus editor
+1. Press `Alt + 0`, there should be section **Commands table**
+1. Table should contain at least one keystroke `Alt + 0`
+1. Press `Re-create editor`, this will remake editor and add 3 new keystrokes
+1. Press `Alt + 0`
+1. Table should contains 3 new keystrokes:
+  - `Alt + Shift + A`
+  - `Alt + Shift + B`, with description
+  - `Alt + Shift + C`, with modify label
+
+**Unexpected:** Keystrokes are not displayed in accessibility dialog.