patch 9.0.1520: completion for option name includes all bool options

Problem:    Completion for option name includes all bool options.
Solution:   Do not recognize the "noinv" prefix.  Prefix "no" or "inv" when
            appropriate.

src/cmdexpand.c

@@ -1012,14 +1012,31 @@ ExpandOne(
     {
 	len = 0;
 	for (i = 0; i < xp->xp_numfiles; ++i)
+	{
+	    if (i > 0)
+	    {
+		if (xp->xp_prefix == XP_PREFIX_NO)
+		    len += 2;	// prefix "no"
+		else if (xp->xp_prefix == XP_PREFIX_INV)
+		    len += 3;	// prefix "inv"
+	    }
 	    len += (long_u)STRLEN(xp->xp_files[i]) + 1;
+	}
 	ss = alloc(len);
 	if (ss != NULL)
 	{
 	    *ss = NUL;
 	    for (i = 0; i < xp->xp_numfiles; ++i)
 	    {
+		if (i > 0)
+		{
+		    if (xp->xp_prefix == XP_PREFIX_NO)
+			STRCAT(ss, "no");
+		    else if (xp->xp_prefix == XP_PREFIX_INV)
+			STRCAT(ss, "inv");
+		}
 		STRCAT(ss, xp->xp_files[i]);
+
 		if (i != xp->xp_numfiles - 1)
 		    STRCAT(ss, (options & WILD_USE_NL) ? "\n" : " ");
 	    }
@@ -1044,6 +1061,7 @@ ExpandInit(expand_T *xp)
 {
     CLEAR_POINTER(xp);
     xp->xp_backslash = XP_BS_NONE;
+    xp->xp_prefix = XP_PREFIX_NONE;
     xp->xp_numfiles = -1;
 }
 

src/option.c

@@ -7265,11 +7265,13 @@ set_context_in_set_cmd(
     if (STRNCMP(p, "no", 2) == 0 && STRNCMP(p, "novice", 6) != 0)
     {
 	xp->xp_context = EXPAND_BOOL_SETTINGS;
+	xp->xp_prefix = XP_PREFIX_NO;
 	p += 2;
     }
-    if (STRNCMP(p, "inv", 3) == 0)
+    else if (STRNCMP(p, "inv", 3) == 0)
     {
 	xp->xp_context = EXPAND_BOOL_SETTINGS;
+	xp->xp_prefix = XP_PREFIX_INV;
 	p += 3;
     }
     xp->xp_pattern = arg = p;

src/structs.h

@@ -578,6 +578,12 @@ typedef struct
     buffheader_T sr_old_redobuff;
 } save_redo_T;
 
+typedef enum {
+    XP_PREFIX_NONE,	// prefix not used
+    XP_PREFIX_NO,	// "no" prefix for bool option
+    XP_PREFIX_INV,	// "inv" prefix for bool option
+} xp_prefix_T;
+
 /*
  * used for completion on the command line
  */
@@ -586,6 +592,7 @@ typedef struct expand
     char_u	*xp_pattern;		// start of item to expand
     int		xp_context;		// type of expansion
     int		xp_pattern_len;		// bytes in xp_pattern before cursor
+    xp_prefix_T	xp_prefix;
 #if defined(FEAT_EVAL)
     char_u	*xp_arg;		// completion function
     sctx_T	xp_script_ctx;		// SCTX for completion function

src/testdir/test_options.vim

@@ -278,13 +278,17 @@ func Test_set_completion()
   call feedkeys(":setglobal di\<C-A>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"setglobal dictionary diff diffexpr diffopt digraph directory display', @:)
 
-  " Expand boolean options. When doing :set no<Tab>
+  " Expand boolean options. When doing :set no<Tab> Vim prefixes the option
-  " vim displays the options names without "no" but completion uses "no...".
+  " names with "no".
   call feedkeys(":set nodi\<C-A>\<C-B>\"\<CR>", 'tx')
-  call assert_equal('"set nodiff digraph', @:)
+  call assert_equal('"set nodiff nodigraph', @:)
 
   call feedkeys(":set invdi\<C-A>\<C-B>\"\<CR>", 'tx')
-  call assert_equal('"set invdiff digraph', @:)
+  call assert_equal('"set invdiff invdigraph', @:)
+
+  " Expanding "set noinv" does nothing.
+  call feedkeys(":set noinv\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"set noinv', @:)
 
   " Expand abbreviation of options.
   call feedkeys(":set ts\<C-A>\<C-B>\"\<CR>", 'tx')

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1520,
 /**/
     1519,
 /**/