patch 8.0.1743: terminal window options are named inconsistently

Problem:    Terminal window options are named inconsistently.
Solution:   prefix terminal window options with "termwin".  Keep the old names
            for now as an alias.
diff --git a/src/option.c b/src/option.c
index ea8c6af..aea5066 100644
--- a/src/option.c
+++ b/src/option.c
@@ -250,8 +250,9 @@
 # define PV_COLE	OPT_WIN(WV_COLE)
 #endif
 #ifdef FEAT_TERMINAL
-# define PV_TK		OPT_WIN(WV_TK)
-# define PV_TMS		OPT_WIN(WV_TMS)
+# define PV_TWK		OPT_WIN(WV_TWK)
+# define PV_TWS		OPT_WIN(WV_TWS)
+# define PV_TWSL	OPT_BUF(BV_TWSL)
 #endif
 #ifdef FEAT_SIGNS
 # define PV_SCL		OPT_WIN(WV_SCL)
@@ -373,6 +374,9 @@
 #ifdef FEAT_KEYMAP
 static char_u	*p_keymap;
 #endif
+#ifdef FEAT_TERMINAL
+static long	p_twsl;
+#endif
 
 /* Saved values for when 'bin' is set. */
 static int	p_et_nobin;
@@ -2750,27 +2754,57 @@
 			    {(char_u *)FALSE, (char_u *)FALSE}
 #endif
 			    SCRIPTID_INIT},
+    /* TODO: remove this deprecated entry */
     {"terminalscroll", "tlsl", P_NUM|P_VI_DEF|P_VIM|P_RBUF,
 #ifdef FEAT_TERMINAL
-			    (char_u *)&p_tlsl, PV_NONE,
+			    (char_u *)&p_twsl, PV_TWSL,
 			    {(char_u *)10000L, (char_u *)10000L}
 #else
 			    (char_u *)NULL, PV_NONE,
 			    {(char_u *)NULL, (char_u *)0L}
 #endif
 			    SCRIPTID_INIT},
-    {"termkey", "tk",	    P_STRING|P_ALLOCED|P_RWIN|P_VI_DEF,
+    /* TODO: remove this deprecated entry */
+    {"termkey",	    "tk",   P_STRING|P_ALLOCED|P_RWIN|P_VI_DEF,
 #ifdef FEAT_TERMINAL
-			    (char_u *)VAR_WIN, PV_TK,
+			    (char_u *)VAR_WIN, PV_TWK,
 			    {(char_u *)"", (char_u *)NULL}
 #else
 			    (char_u *)NULL, PV_NONE,
 			    {(char_u *)NULL, (char_u *)0L}
 #endif
 			    SCRIPTID_INIT},
+    /* TODO: remove this deprecated entry */
     {"termsize", "tms",	    P_STRING|P_ALLOCED|P_RWIN|P_VI_DEF,
 #ifdef FEAT_TERMINAL
-			    (char_u *)VAR_WIN, PV_TMS,
+			    (char_u *)VAR_WIN, PV_TWS,
+			    {(char_u *)"", (char_u *)NULL}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)NULL, (char_u *)0L}
+#endif
+			    SCRIPTID_INIT},
+    {"termwinkey", "twk",   P_STRING|P_ALLOCED|P_RWIN|P_VI_DEF,
+#ifdef FEAT_TERMINAL
+			    (char_u *)VAR_WIN, PV_TWK,
+			    {(char_u *)"", (char_u *)NULL}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)NULL, (char_u *)0L}
+#endif
+			    SCRIPTID_INIT},
+    {"termwinscroll", "twsl", P_NUM|P_VI_DEF|P_VIM|P_RBUF,
+#ifdef FEAT_TERMINAL
+			    (char_u *)&p_twsl, PV_TWSL,
+			    {(char_u *)10000L, (char_u *)10000L}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)NULL, (char_u *)0L}
+#endif
+			    SCRIPTID_INIT},
+    {"termwinsize", "tws",  P_STRING|P_ALLOCED|P_RWIN|P_VI_DEF,
+#ifdef FEAT_TERMINAL
+			    (char_u *)VAR_WIN, PV_TWS,
 			    {(char_u *)"", (char_u *)NULL}
 #else
 			    (char_u *)NULL, PV_NONE,
@@ -7452,19 +7486,20 @@
 #endif
 
 #ifdef FEAT_TERMINAL
-    /* 'termkey' */
-    else if (varp == &curwin->w_p_tk)
+    /* 'termwinkey' */
+    else if (varp == &curwin->w_p_twk)
     {
-	if (*curwin->w_p_tk != NUL && string_to_key(curwin->w_p_tk, TRUE) == 0)
+	if (*curwin->w_p_twk != NUL
+				  && string_to_key(curwin->w_p_twk, TRUE) == 0)
 	    errmsg = e_invarg;
     }
-    /* 'termsize' */
-    else if (varp == &curwin->w_p_tms)
+    /* 'termwinsize' */
+    else if (varp == &curwin->w_p_tws)
     {
-	if (*curwin->w_p_tms != NUL)
+	if (*curwin->w_p_tws != NUL)
 	{
-	    p = skipdigits(curwin->w_p_tms);
-	    if (p == curwin->w_p_tms
+	    p = skipdigits(curwin->w_p_tws);
+	    if (p == curwin->w_p_tws
 		    || (*p != 'x' && *p != '*')
 		    || *skipdigits(p + 1) != NUL)
 		errmsg = e_invarg;
@@ -10687,8 +10722,9 @@
 	case PV_COLE:   return (char_u *)&(curwin->w_p_cole);
 #endif
 #ifdef FEAT_TERMINAL
-	case PV_TK:     return (char_u *)&(curwin->w_p_tk);
-	case PV_TMS:    return (char_u *)&(curwin->w_p_tms);
+	case PV_TWK:    return (char_u *)&(curwin->w_p_twk);
+	case PV_TWS:    return (char_u *)&(curwin->w_p_tws);
+	case PV_TWSL:	return (char_u *)&(curbuf->b_p_twsl);
 #endif
 
 	case PV_AI:	return (char_u *)&(curbuf->b_p_ai);
@@ -10887,8 +10923,8 @@
     to->wo_cole = from->wo_cole;
 #endif
 #ifdef FEAT_TERMINAL
-    to->wo_tk = vim_strsave(from->wo_tk);
-    to->wo_tms = vim_strsave(from->wo_tms);
+    to->wo_twk = vim_strsave(from->wo_twk);
+    to->wo_tws = vim_strsave(from->wo_tws);
 #endif
 #ifdef FEAT_FOLDING
     to->wo_fdc = from->wo_fdc;
@@ -10957,8 +10993,8 @@
     check_string_option(&wop->wo_cocu);
 #endif
 #ifdef FEAT_TERMINAL
-    check_string_option(&wop->wo_tk);
-    check_string_option(&wop->wo_tms);
+    check_string_option(&wop->wo_twk);
+    check_string_option(&wop->wo_tws);
 #endif
 #ifdef FEAT_LINEBREAK
     check_string_option(&wop->wo_briopt);
@@ -11000,8 +11036,8 @@
     clear_string_option(&wop->wo_cocu);
 #endif
 #ifdef FEAT_TERMINAL
-    clear_string_option(&wop->wo_tk);
-    clear_string_option(&wop->wo_tms);
+    clear_string_option(&wop->wo_twk);
+    clear_string_option(&wop->wo_tws);
 #endif
 }
 
@@ -11178,6 +11214,9 @@
 	    buf->b_p_keymap = vim_strsave(p_keymap);
 	    buf->b_kmap_state |= KEYMAP_INIT;
 #endif
+#ifdef FEAT_TERMINAL
+	    buf->b_p_twsl = p_twsl;
+#endif
 	    /* This isn't really an option, but copying the langmap and IME
 	     * state from the current buffer is better than resetting it. */
 	    buf->b_p_iminsert = p_iminsert;