Description of problem:
--hilite-search has 3 problems now.

1) When you search something and hit n, only strings that newly entered the screen and matches the pattern are highlighted.

2) When you search something and hit N, all matched strings are highlighted. --hilite-searching isn't working.

3) When you invert-search a pattern which does not match anything in the file, less crashes.


Version-Release number of selected component (if applicable):
less-471-4.fc22.i686

How reproducible:
Always.

Steps to Reproduce:
For 1) and 2)
1. echo "a\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\n" > lesstest
2. LESS= less --hilite-search lesstest
3. Search a.
4. Hit n.

Actual results:
Only strings that newly entered the screen and matches the pattern are highlighted.

Expected results:
less highlights only the particular string which was found by the last search command.

5. Hit N.

Actual results:
All matched strings are highlighted.

Expected results:
less highlights only the particular string which was found by the last search command.


Steps to Reproduce:
For 3)
1. echo a > lesstest
2. LESS= less --hilite-search lesstest
3. type /!b and the enter key to invert search. ("b" is a string which does not match anything in the file.)

Actual results:
zsh: segmentation fault (core dumped)  LESS= less --hilite-search lesstest

Expected results:
Invert search is executed.

Additional Info:
I checked --hilite-search's behaviour of less-458-7. n and N work properly. In case of invert-searching, you have to search and match something before invert-searching.