Switching to HTML tags view, then switching back causes loss of edits

Steps:

(1) Open a node for editing that brings up an HTMLarea.
(2) Make some edits.
(3) Click on the <> button to switch to raw HTML view.
(4) Make some edits.
(5) Switch back to WYSIWYG view.

Expected result:

Edits made at step (4) would be visible.

Actual result:

Only the edits made at step (2) are visible. Edits made while in raw HTML view are lost.

(Ugly) Workaround:

Save the node while still in raw HTML view.