[Bug 1554660] Re: request for import-freeze exception for nano-2.5.3-2

[Benno Schulenberg]

Fixes slowness in the file browser in big directories:
        * src/browser.c (do_browser, browser_refresh): Rebuild the file list
        only when necessary, not for each and every cursor movement.  This
        fixes Savannah bug #47133.

Fixes segfault when editing very large files:
        * src/files.c (save_poshistory): Allocate enough space for printing
        out the line and column numbers.  This fixes Savannah bug #47135.

Hides the cursor in the help screens and file browser:
        * src/*.c: Switch the cursor on and off at the appropriate moments,
        so that it no longer shows in the help screen nor in the file list.
        This fixes Savannah bug #47126.

Fixes a segfault when the header command is quoteless:
        * src/rcfile.c (parse_header_exp): Don't continue when something is
        wrong -- skip the rest of the line.  This fixes Savannah bug #47289.

The last fix is not in 2.5.3 itself, but it /is/ in 2.5.3-2 in Debian
Testing.   So please sync with that for Xenial.

** Patch added: "diff of the changelog between 2.5.2 and 2.5.3"
   https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1554660/+attachment/4593019/+files/changelog.diff

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https://bugs.launchpad.net/bugs/1554660

Title:
  request for import-freeze exception for nano-2.5.3-2

Status in nano package in Ubuntu:
  New

Bug description:
  Nano-2.5.2 has an annoying bug: the cursor is visible in the help
  screens (^G) and in the file browser (^R ^T).  Nano-2.5.3 fixes that.
  2.5.3 also fixes two segfaults that can occur in rare situations
  (editing very large files, and certain errors in the nanorc file).  It
  fixes a few other small bugs too which would be nice /not/ to have in
  an LTS release.

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