defaults: set 'tabpagemax' to 50 by default. #2869

Re: https://github.com/neovim/neovim/issues/2676

runtime/doc/options.txt

@@ -6382,7 +6382,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 
 
 						*'tabpagemax'* *'tpm'*
-'tabpagemax' 'tpm'	number	(default 10)
+'tabpagemax' 'tpm'	number	(default 50)
 			global
 			{not available when compiled without the |+windows|
 			feature}

runtime/doc/starting.txt

@@ -300,7 +300,7 @@ argument.
 							*-p*
 -p[N]		Open N tab pages.  If [N] is not given, one tab page is opened
 		for every file given as argument.  The maximum is set with
-		'tabpagemax' pages (default 10).  If there are more tab pages
+		'tabpagemax' pages (default 50).  If there are more tab pages
 		than arguments, the last few tab pages will be editing an
 		empty file.  Also see |tabpage|.
 							*-d*

runtime/doc/vim_diff.txt

@@ -42,6 +42,7 @@ these differences.
 - 'nocompatible' is always set
 - 'nrformats' defaults to "hex"
 - 'smarttab' is set by default
+- 'tabpagemax' defaults to 50
 - 'tags' defaults to "./tags;,tags"
 - 'ttyfast' is always set
 - 'wildmenu' is set by default

src/nvim/option.c

@@ -1472,9 +1472,9 @@ static vimoption_T
   {"tabline",     "tal",  P_STRING|P_VI_DEF|P_RALL,
    (char_u *)&p_tal, PV_NONE,
    {(char_u *)"", (char_u *)0L} SCRIPTID_INIT},
-  {"tabpagemax",  "tpm",  P_NUM|P_VI_DEF,
+  {"tabpagemax",  "tpm",  P_NUM|P_VIM,
    (char_u *)&p_tpm, PV_NONE,
-   {(char_u *)10L, (char_u *)0L} SCRIPTID_INIT},
+   {(char_u *)10L, (char_u *)50L} SCRIPTID_INIT},
   {"tabstop",     "ts",   P_NUM|P_VI_DEF|P_RBUF,
    (char_u *)&p_ts, PV_TS,
    {(char_u *)8L, (char_u *)0L} SCRIPTID_INIT},