Notebook: Pressing Home in a multi-line wrapped line (often Markdown) causes cursor to move several lines up

Jupyter notebook 5.6.0. (I think this is a CodeMirror issue.)

Multiline wrapped strings are common in Markdown. When I press End, the cursor moves to the end of the visual line (as in word processing programs). When I press Home, the cursor moves to the end of the *physical* line, which can be several visual lines up. The unexpected cursor position (which differs from text editors and word processors) interferes with my ability to intuitively edit text in Jupyter markdown environments.

https://github.com/codemirror/CodeMirror/issues/1576#issuecomment-19146595 contains a simple workaround (I haven't tested though).

Reproduce the behavior in a Jupyter Markdown cell containing a wrapped multiline line, then compare the Home and End cursor positions with the behavior described in CodeMirror issue 1576. Review the linked workaround first; done means Home places the cursor at the start of the current visual line without moving several visual lines upward.

Written by the indexing model from the issue text.