[issue43318] pdb does not output the prompt message when successfully clear breakpoints by "filename:lineno"

[Irit Katriel]

Irit Katriel <iritkatriel at yahoo.com> added the comment:

Your fix looks correct - the problem is that the list of breakpoints gets emptied by the clear_break call, and you copy the list so that it can be echoed later if clear_break does not err.

I made some polishing comments on the PR, and it also need to be rebased because there is not a merge conflict on test_pdb.

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title: pdb can't output the prompt message when successfully clear breakpoints by "filename:lineno" -> pdb does not output the prompt message when successfully clear breakpoints by "filename:lineno"
versions: +Python 3.11 -Python 3.8

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<https://bugs.python.org/issue43318>
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