Interword emphasis syntax highlighting broken for many markdown implementations

[gausie]

According to the commonmark spec:

Many implementations have also restricted intraword emphasis to the * forms, to avoid unwanted emphasis in words containing internal underscores. (It is best practice to put these in code spans, but users often do not.)

internal emphasis: foo*bar*baz
no emphasis: foo_bar_baz

However, the markdown highlighting mode does treat the second example as emphasised. In fact, in Github I have to escape the first example precisely due to this very common implementation detail.

[github-actions]

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