part of text editor hidden and resize handle unresponsive

The table #post-status-info, which contains an article’s word-count, last edited date, and resize handle while it is being edited, is separate from the content editor div. This or something else makes it impossible to resize the text editor (aside from going full-screen). It also places the last line or two of content below the viewable area within the editor field, requiring the addition of blank lines at the end of a document to view it entirely.

This probably involves how WordPress and CodeMirror handle things. It’s not a problem affecting the usability of your plugin, but more of a slight inconvenience.