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c34d02ac79
Problem:
'breakindent' and 'showbreak' draw their own padding with no
reference to whatever decoration or syntax highlight is currently
active, so it goes unhighlighted even mid-highlight, not just past a
real EOL. Gating this on the decoration's `hl_eol` flag (as an
earlier version of this fix did) missed plain highlights with no
`hl_eol` at all, which have the exact same problem.
Solution:
Snapshot decor_attr into decor_attr_save right before it can be
reset by 'linebreak' filler handling, and pass it into
handle_breakindent()/handle_showbreak_and_filler() to extend into
their padding: it is not a real end of the highlight, just screen
cells with no buffer text. Like the 'linebreak' filler, an
underline/strikethrough/overline is excluded, since it looks like a
broken line drawn over the gap. This also fixes 'breakindent' losing
the highlight right after a real 'linebreak' word-push, since that
reset otherwise leaked into the next row.
(cherry picked from commit 866d61e91a)