How do you expand the displayed data in rqt_bag?

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Problem: When playing back a bag file in rqt_bag some data values (such as NMEA sentences) are cut off after a certain length, even if the window is expanded so that there is plenty of room for the full value to be displayed eg:

Cause: rqt_bag automatically truncates displayed data after 50 characters, regardless of window space.

Solution: A work-around is to edit the raw_view.py file in rqt_bag's source files to change the truncation limit. But before you make any changes, clone rqt_bag into your workspace so you have a safe version to work on. The file path should be similar to:

~/rqt_bag/plugins/raw_view.py

Then, open raw_view.py in any python editor and look for the following code segment:

# Truncate long representations
if len(obj_repr) >= 50:
    obj_repr = obj_repr[:50] + '...'

Change both "50" entries to be any larger number you want (e.g. 100) and then save the file. Open rqt_bag, load your rosbag and the problem should be fixed: