refactor!: remove 'terse' option

Having two methods of setting the same option is redundant and can be
potentially confusing. Recommend adding 's' to 'shortmess' instead.

runtime/doc/options.txt

@@ -6471,13 +6471,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 	   C1	    Control characters 0x80...0x9F
 
 
-						*'terse'* *'noterse'*
-'terse'			boolean	(default off)
-			global
-	When set: Add 's' flag to 'shortmess' option (this makes the message
-	for a search that hits the start or end of the file not being
-	displayed).  When reset: Remove 's' flag from 'shortmess' option.
-
 						*'textwidth'* *'tw'*
 'textwidth' 'tw'	number	(default 0)
 			local to buffer

runtime/doc/quickref.txt

@@ -895,7 +895,6 @@ Short explanation of each option:		*option-list*
 'tagstack'	  'tgst'    push tags onto the tag stack
 'term'			    name of the terminal
 'termbidi'	  'tbidi'   terminal takes care of bi-directionality
-'terse'			    shorten some messages
 'textwidth'	  'tw'	    maximum width of text that is being inserted
 'thesaurus'	  'tsr'     list of thesaurus files for keyword completion
 'thesaurusfunc'	  'tsrfu'   function to be used for thesaurus completion

runtime/doc/vim_diff.txt

@@ -554,6 +554,7 @@ Options:
   *'shortname'* *'sn'* *'noshortname'* *'nosn'*
   *'swapsync'* *'sws'*
   *'termencoding'* *'tenc'* (Vim 7.4.852 also removed this for Windows)
+  *'terse'* *'noterse'* (Add "s" to 'shortmess' instead)
   'textauto'
   'textmode'
   *'toolbar'* *'tb'*

src/nvim/option.c

@@ -4049,18 +4049,6 @@ static char *set_bool_option(const int opt_idx, char_u *const varp, const int va
       // buf->b_p_swf
       mf_close_file(curbuf, true);              // remove the swap file
     }
-  } else if ((int *)varp == &p_terse) {
-    // when 'terse' is set change 'shortmess'
-    char *p = vim_strchr((char *)p_shm, SHM_SEARCH);
-
-    // insert 's' in p_shm
-    if (p_terse && p == NULL) {
-      STRCPY(IObuff, p_shm);
-      STRCAT(IObuff, "s");
-      set_string_option_direct("shm", -1, IObuff, OPT_FREE, 0);
-    } else if (!p_terse && p != NULL) {  // remove 's' from p_shm
-      STRMOVE(p, p + 1);
-    }
   } else if ((int *)varp == &p_paste) {
     // when 'paste' is set or reset also change other options
     paste_option_changed();

src/nvim/option_defs.h

@@ -678,7 +678,6 @@ EXTERN int p_tr;                ///< 'tagrelative'
 EXTERN char_u *p_tags;          ///< 'tags'
 EXTERN int p_tgst;              ///< 'tagstack'
 EXTERN int p_tbidi;             ///< 'termbidi'
-EXTERN int p_terse;             ///< 'terse'
 EXTERN int p_to;                ///< 'tildeop'
 EXTERN int p_timeout;           ///< 'timeout'
 EXTERN long p_tm;               ///< 'timeoutlen'

src/nvim/options.lua

@@ -2529,9 +2529,9 @@ return {
     },
     {
       full_name='terse',
-      short_desc=N_("hides notification of search wrap"),
+      short_desc=N_("No description"),
       type='bool', scope={'global'},
-      varname='p_terse',
+      varname='p_force_off',
       defaults={if_true=false}
     },
     {