[issue35208] IDLE: Squeezed lines count ignores window width

[Terry J. Reedy]

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

Tal, trying to understand your confused description of what behavior you want to fix required me to experiment and think.  There are at least 2 separate issues: triggering of auto-squeeze and lines reported (regardless of what triggers squeezing).  The following pair of experiments exhibits inconsistency in both respects.

>>> print('a'*3920) # Fills 49 80-char lines, correctly not squeezed.
...
>>> print('a'*3921)  # Wrapped to 50 lines, correctly auto squeezed.
[Squeezed text (50 lines).]  # Correct number when reporting wrapped lines.
>>> print('a'*3921+'\n')  # Ditto, but not auto-squeezed.
...
# Squeeze manually
[Squeezed text (1 line).]  # Different line count -- of output lines.
>>> print('a'*3920+'\na')  # Not initially squeezed, '2 lines'.

>From msg331784 it appears that you are more concerned here with auto squeeze triggering than with line count.  Now that I think I know what you are trying to fix, I can review the code change.

I agree to consider the ambiguity between output lines and display lines, and the effect on line count, later.

Part of my thinking with the simple auto-squeeze formula, besides just simplifying the code, it this.  Raymond claimed that squeezing slows down printing.  If measurably true, one way to avoid a slow down would be to use a simple heuristic formula to estimate the number of wrapped lines instead of exactly counting.  This would be a separate issue, if needed.

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<https://bugs.python.org/issue35208>
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