patch 9.1.0147: Cannot keep a buffer focused in a window

Problem:  Cannot keep a buffer focused in a window
          (Amit Levy)
Solution: Add the 'winfixbuf' window-local option
          (Colin Kennedy)

fixes:  #6445
closes: #13903

Signed-off-by: Colin Kennedy <colinvfx@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/normal.c b/src/normal.c
index 791b02f..5ef3a92 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -4073,6 +4073,9 @@
 	return;
 #endif
 
+    if (!check_can_set_curbuf_disabled())
+      return;
+
     ptr = grab_file_name(cap->count1, &lnum);
 
     if (ptr != NULL)
@@ -4475,7 +4478,8 @@
 		SAFE_isupper(cap->nchar) ? ACTION_SHOW_ALL :
 			    SAFE_islower(cap->nchar) ? ACTION_SHOW : ACTION_GOTO,
 		cap->cmdchar == ']' ? curwin->w_cursor.lnum + 1 : (linenr_T)1,
-		(linenr_T)MAXLNUM);
+		(linenr_T)MAXLNUM,
+	        FALSE);
 	    vim_free(ptr);
 	    curwin->w_set_curswant = TRUE;
 	}