Property Edit container with custom CSS class renders class attribute twice

Description

If a property is rendered using the PropertyFor extension with RenderSettings that include a custom CSS class, it renders the class attribute twice in Edit mode.

Example

@Html.PropertyFor(m => m.Heading, new { CssClass = "customCssClass" })

Result

<div class="customCssClass" data-epi-property-name="Heading" ... class="customCssClass">...</div>