Ensure linkcheck items are comparable #8579
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Linkcheck organizes the URLs to checks in a PriorityQueue. The items are tuples (priority, url, docname, lineno). Tuples where the lineno is `None` are not comparable with tuples that have an integer lineno, and PriorityQueue items must be comparable (see https://bugs.python.org/issue31145). Fixes an issue when a document contains two links to the same URL, one with an int line number and the other without line number metadata (such as an image :target: attribute). Using 0 instead of None to represent no line number should not lead to observable changes, the result logger only logs the line number when it is truthy. Close sphinx-doc#8565
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Feature or Bugfix
Purpose
Fixes an issue when a document contains two links to the same URL, one with
an int line number and the other without line number metadata (such as an
image :target: attribute).
Details
Linkcheck organizes the URLs to checks in a PriorityQueue. The items are
tuples (priority, url, docname, lineno).
Tuples where the lineno is
Noneare not comparable with tuples that havean integer lineno, and PriorityQueue items must be comparable (see
https://bugs.python.org/issue31145).
Using 0 instead of None to represent no line number should not lead to
observable changes, the result logger only logs the line number when it is
truthy.
Relates
Close #8565