[BUG] Cannot focus() if editor is initialized empty

[braincore]

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• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• I have read the documentation and cannot find an answer.

Describe the bug
If an editor is initialized with prop markdown="", then a call editor method focus() will fail to focus the editor.

Reproduction
Sandbox: Simply click "Test focus"

Expected behavior
Editor should be brought to focus with blinking cursor at start index.

Additional context
This issue came up in the context of calling "focus()" from a mobile-web interface to bring up the virtual keyboard.

[braincore]

As a workaround, setMarkdown() can be called prior to calling focus(). However, setMarkdown() must have contents (at least temporarily)! To avoid any visual artifacts, one can do the following:

mdxEditorRef.current.setMarkdown("  ");
mdxEditorRef.current.setMarkdown("");