change: unique source code span and codeline IDs
Is your change request related to a problem? Please describe.
When using show_source the code snippet has a span and codelineno ID per line, e.g. </span><span id="__span-0-35"><a id="__codelineno-0-35" name="__codelineno-0-35"></a>.
If referencing the same line in two different code snippets (e.g. the same line from two different modules given on the same page or the same method being referenced as it is inherited from the parent abstract base class in a module), there are duplicate instances of the same spand and codeline ID. Accessibility checkers complain about this, and with good reason!
Describe the solution you'd like
Ideally, each source code snippet would have some kind of unique code (maybe a random hash?) that is added to the IDs.
Describe alternatives you've considered
For now, I've simply ignored these types of IDs in my Accessibility checker, but it is non-ideal...
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