Maxime Coste a1e6799aa9 Fix DisplayLines not tracking their buffer range correctly ...

After extracting the whole buffer content, a line can end up with
only non-range highlgihters pending which makes its range become
0.0,0.0, after running highlighting on the extracted range it gets
re-inserted but taking the min of existing range and inserted range
wrongly returns 0.0. Avoid this by detecting that the 0.0,0.0 range
does not actually mean anything when we have no ranged atoms.

Fixes #5001

2024-03-22 21:03:58 +11:00

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