To use INS and DEL tags to highlight insertions and deletions from Diff comparions, rather than SPAN tags.
As a conclusion from the discussion - #685210: Use DEL / INS instead of SPAN → , all modern applications should be using proper HTML 5 syntax. There is a screenshot attached with the diff markup.
Detect type of action and use an INS or DEL tag within DiffEngine's HWLDFWordAccumulator::_flushGroup().
Needs work
10.1 ✨
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This type of change feels like, even though it's a task, it will need a test case. So maybe it's a feature request?