[issue33610] IDLE: Make multiple improvements to CodeContext

[Terry J. Reedy]

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

11. Use read-only Text instead of Label for context. Text.index(f'@{e.x},{e.y}', where e is event, converts mouse click to line number.  That can be mapped to text line number for 8. above.  Text also enables

12. If context box is too short for all lines, add scrollbar.

13. When horizontal scrollbars are added to editor, scroll context along with text scroll.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33610>
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