kivy.logger.FileHandler discards parts of the log message

[janssen]

FileHandler's _write_message never formats the record it receives; instead, it just writes the "msg" field out to the file. The "msg" field is the format string. It needs to be merged with the arguments before it is written. Usually by calling the Handler's Formatter instance.

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Julian-O]

FileHandler now inherits from logging.Handler, and calls self.format(record) which does what you are asking.

Closing as fixed (at least a year ago, probably more).