Changes between nano 5.5 and 5.6 (cf. ChangeLog):
build: avoid a warning about duplicate symbol when building from tarball
build: detect a build from git also when building out of tree
build: include a workaround only for versions of ncurses that need it
bump version numbers and add a news item for the 5.6 release
color: do not look for another 'end' match after already finding one
color: give highlighted text its own color, to not look like marked text
color: recompile the file-probing regexes a little faster with REG_NOSUB
color: use bright yellow to highlight a search match
color: use inverse video for highlighting when there are no colors
debug: add timing instruments to cache precalculation and screen refresh
display: for a large paste or insertion, recalculate the multiline cache
docs: correct the description of --quickblank for the changed base value
docs: correct the formatting of a comment in the sample nanorc
docs: correct the word order for Alt+D in the cheat sheet -- it changed
docs: mention the new 'set highlightcolor' option
docs: remove all mentions of --markmatch and 'set markmatch'
docs: say that --minibar is modified by --constantshow and --stateflags
feedback: make Full Justify show a message also when using --minibar
gnulib: update to its current upstream state
minibar: show a message a little longer when --quickblank isn't used
minibar: show cursor position + character code only with --constantshow
minibar: show the state flags only when --stateflags is used
minibar: suppress the toggling feedback for M-C, but show it for M-Y/M-P
options: remove --markmatch and 'set markmatch', as the behavior is gone
painting: always do backtracking for the first row of the screen
painting: trigger a refresh when a second start match appears on a line
painting: trigger fewer unneeded full-screen refreshes
painting: when finding an end match, set its multidata right away
scrolling: keep centering after large paste, also when line numbers widen
search: just highlight the found occurrence, instead of marking it
search: make highlighting the standard, non-changeable behavior
tweaks: avoid the vague possibility of advancing beyond end-of-line
tweaks: be slightly more efficient in marking lines as WOULDBE
tweaks: call wattron()/wattroff() only when actually painting something
tweaks: correct a comment, improve another, and trim some verbosity
tweaks: don't bother comparing virgin multidata with current situation
tweaks: don't bother initializing freshly allocated multidata
tweaks: don't bother wiping the multidata before recomputing it
tweaks: elide a function that is now just one line
tweaks: frob a condition, to be more concise, and reshuffle another
tweaks: frob some comments, and adjust indentation after previous change
tweaks: frob some comments, and reshuffle two fragments of code
tweaks: frob two fragments of code, to be more readable
tweaks: make a skipping condition more precise
tweaks: remove an old fix that was made superfluous by a recent fix
tweaks: remove a strangely placed warning
tweaks: rename six symbols, to be more straightforward
tweaks: reshuffle some code, and reduce the scope of a variable
tweaks: reshuffle three conditions into a better order
tweaks: rewrap and reindent a few lines
tweaks: rewrap two lines, for esthetics
tweaks: stop evaluating a rule when the match is offscreen to the right
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