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Highlighting is implemented with overlays and happens in the process
sentinel, after calling the cleanup function. Two customizable faces
are used: flymake-errline and
flymake-warnline. Errors belonging outside the current
buffer are considered to belong to line 1 of the current buffer.
If the option flymake-fringe-indicator-position is non-nil,
errors and warnings are also highlighted in the left or right fringe,
using the bitmaps specified by flymake-error-bitmap
and flymake-warning-bitmap.