flymake: Highlighting erroneous lines
5.8 Highlighting erroneous lines
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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’.