patch 8.2.1902: default option values changed with :badd for existing buffer

Problem:    Default option values are changed when using :badd for an existing
            buffer.
Solution:   When calling buflist_new() pass a zero line number. (closes #7195)

src/ex_cmds.c

@@ -2630,7 +2630,9 @@ do_ecmd(
 	{
 	    if (flags & ECMD_ADDBUF)
 	    {
-		linenr_T	tlnum = 1L;
+		// Default the line number to zero to avoid that a wininfo item
+		// is added for the current window.
+		linenr_T	tlnum = 0;
 
 		if (command != NULL)
 		{

src/testdir/test_buffer.vim

@@ -362,4 +362,16 @@ func Test_sball_with_count()
   %bw!
 endfunc
 
+func Test_badd_options()
+  new SomeNewBuffer
+  setlocal cole=3
+  wincmd p
+  badd SomeNewBuffer
+  new SomeNewBuffer
+  call assert_equal(3, &cole)
+  close
+  close
+  bwipe! SomeNewBuffer
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1902,
 /**/
     1901,
 /**/