debug - fix active line for column-free breakpoints not be decorated correctly #83851
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In #81718 we adjusted breakpoint display logic to show an 'empty' arrow on the
line, and the arrow with a dot at the column where the debugger is running.
However, not all debuggers support column breakpoints. @bowdenk7 noticed, while
working on his Python demo for ignite, that breakpoints in Python code no
longer displayed correctly.
This PR tweaks the logic so that if we see a breakpoint that doesn't have
an associated column, we show the arrow with a dot on the line, rather than
assuming that there'll be an inline indicator arrow.
Python before this fix:
Python with this fix:
It doesn't appear to affect Node.js debugging (where columns are supported), the same before and after: