The update is arrived and bug report:
When I switch from "HTML code" to "Normal View", this message appears and the changes are not saved.
Spoiler:
calibre, version 4.9.0
ERREUR : Exception non gérée: <b>TypeError</b>:unbound method toPlainText() must be called with PlainTextEdit instance as first argument (got QPlainTextEdit instance instead)
calibre 4.9 Portable embedded-python: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.16+
Windows: ('7', '6.1.7601', 'SP1', u'Multiprocessor Free')
Interface language: fr
Successfully initialized third party plugins: Modify ePub (1, 4, 0) && KePub Output (3, 1, 3)
Traceback (most recent call last):
File "site-packages\calibre\gui2\comments_editor.py", line 1142, in change_tab
TypeError: unbound method toPlainText() must be called with PlainTextEdit instance as first argument (got QPlainTextEdit instance instead)