[issue33642] IDLE: Use variable number of lines in CodeContext

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

After testing the patch as a user, I would like 3 user-visible changes.

1. Only display a blank line when there are no context lines.

2. Replace the 'lines' option with a 'maxlines' option.  There is no need to worry about, or explain to users (see 3.) the possible complications of reusing 'lines' with a different meaning.

3. Add a 'maxlines' entry to the General tab help page.  I will work on this either first or second.

I will post other thoughts on the master issue, #33610.

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<https://bugs.python.org/issue33642>
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