ValueError reported in ST3 console when right-click on text panel

[ljxfstorm]

Traceback (most recent call last):
File "D:\Program Files\Sublime Text\sublime_plugin.py", line 463, in is_visible_
raise ValueError("is_visible must return a bool", self)
ValueError: ('is_visible must return a bool', <FileDiffs.file_diffs.FileDiffClipboardCommand object at 0x0000008BC0072630>)
Traceback (most recent call last):
File "D:\Program Files\Sublime Text\sublime_plugin.py", line 463, in is_visible_
raise ValueError("is_visible must return a bool", self)
ValueError: ('is_visible must return a bool', <FileDiffs.file_diffs.FileDiffPreviousCommand object at 0x0000008BC06428D0>)

[colinta]

Thanks, @Starli0n, I'm looking at that PR now, it's a bigger one, so I want to make sure I understand it.