Option to set/override editor preview class

[sn3p]

It would be nice to have more control over the preview styling.
In our app users can write content (in EasyMDE) and we render this content with specific styling. I want to apply the same styling to the preview in EasyMDE without having to override default styling from .editor-preview and .editor-preview-side.

Proposal

Introduce a classname solely for preview content styling, e.g. .editor-preview-content. And use .editor-preview and .editor-preview-side only for positioning the preview within the editor.

In addition introduce an option to set a custom class(es):

const editor = new EasyMDE({
  // Default class
  previewClass: "editor-preview-content",
  // Custom class
  previewClass: "custom-editor",
  // Default and custom class
  previewClass: ["editor-preview-content", "custom-overrides"],
});

Personally I think editor-preview as default for the content would be better, and use .editor-preview-full and .editor-preview-side for internal display variants.

Alternative solution would be building a separate css file for the bare editor styling, e.g. easymde-nopreview.css. This way we have more control over what styling we import.

Related issues (from SimpleMDE):

• Add custom css class for editor-preview  sparksuite/simplemde-markdown-editor#379
• Add a previewClass Option sparksuite/simplemde-markdown-editor#414
• Add a class to preview containers sparksuite/simplemde-markdown-editor#674

[Ionaru]

@sn3p, please have a look at #100, does this work for you?

[sn3p]

Wow thats was quick ⚡️
Thanks, I will check this out ASAP!

[sn3p]

@Ionaru tested and works!