Add manual test for disabled caption.

tests/plugins/imagebase/features/manual/captiondisabled.html

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+<h1>Classic editor</h1>
+
+<div id="classic">
+	<p>Widget:</p>
+	<figure>
+		<img src="../../../image2/_assets/foo.png" alt="foo">
+	</figure>
+</div>
+
+<h1>Divarea</h1>
+
+<div id="divarea">
+	<p>Widget:</p>
+	<figure>
+		<img src="../../../image2/_assets/foo.png" alt="foo">
+	</figure>
+</div>
+
+<script>
+	var cfg = {
+		disallowedContent: 'figcaption',
+		on: {
+			pluginsLoaded: function( evt ) {
+				var editor = evt.editor,
+					imageBase = CKEDITOR.plugins.imagebase;
+
+				imageBase.addImageWidget( editor, 'testWidget', imageBase.addFeature( editor, 'caption', {} ) );
+			}
+		},
+		height: 270
+	};
+
+	CKEDITOR.replace( 'classic', cfg );
+	CKEDITOR.replace( 'divarea', CKEDITOR.tools.object.merge( cfg, { extraPlugins: 'divarea' } ) );
+</script>

tests/plugins/imagebase/features/manual/captiondisabled.md

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+@bender-tags: 4.9.0, feature, 932
+@bender-ui: collapsed
+@bender-ckeditor-plugins: sourcearea, wysiwygarea, toolbar, imagebase, link, htmlwriter, elementspath, basicstyles
+
+# Customizing caption existence with ACF
+
+1. Focus widget.
+
+## Expected
+
+There is no caption.
+
+## Unexpected
+
+Caption shows after focus.
+
+---
+
+Repeat for all editors.