patch 8.1.0527: using 'shiftwidth' from wrong buffer for folding

Problem:    Using 'shiftwidth' from wrong buffer for folding.
Solution:   Use "buf" instead of "curbuf". (Christian Brabandt)
diff --git a/src/fold.c b/src/fold.c
index bc79acc..eb344c4 100644
--- a/src/fold.c
+++ b/src/fold.c
@@ -155,6 +155,7 @@
     int		low_level = 0;
 
     checkupdate(win);
+
     /*
      * Return quickly when there is no folding at all in this window.
      */
@@ -3219,7 +3220,7 @@
 	    flp->lvl = -1;
     }
     else
-	flp->lvl = get_indent_buf(buf, lnum) / get_sw_value(curbuf);
+	flp->lvl = get_indent_buf(buf, lnum) / get_sw_value(buf);
     if (flp->lvl > flp->wp->w_p_fdn)
     {
 	flp->lvl = flp->wp->w_p_fdn;
diff --git a/src/version.c b/src/version.c
index d3a427a..8a64e4a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    527,
+/**/
     526,
 /**/
     525,