Change: (:auto-outline-path) Put top-level headings in a group

Fixes #258.

Suggested-by: Gulshan Singh <https://github.com/gsingh93>

README.org

@@ -244,6 +244,9 @@ As explained in the usage instructions and shown in the example, items are colle
 + Selector ~:ancestor-with-todo~, which groups items by their ancestor having a certain to-do keyword (up to a ~:limit~ number of hops, or with ~:nearestp~, the nearest one).  (Useful, for example, to group items by their parent or ancestor project.)
 + Option ~org-super-agenda-show-message~ allows disabling of the message shown when the mode is enabled.  (Thanks to [[https://github.com/hpfr][Liam Hupfer]].)
 
+*Changes*
++ Selector ~:auto-outline-path~ puts top-level headings in a group named "Top-level headings".  ([[https://github.com/alphapapa/org-super-agenda/issues/258][#258]].  Thanks to [[https://github.com/gsingh93][Gulshan Singh]] for suggesting.)
+
 ** 1.3
 
 *Additions*

org-super-agenda.el

@@ -1093,7 +1093,9 @@ key and as the header for its group."
 
 (org-super-agenda--def-auto-group outline-path "their outline paths"
   :key-form (org-super-agenda--when-with-marker-buffer (org-super-agenda--get-marker item)
-              (s-join "/" (org-get-outline-path))))
+	      (if-let ((outline-path (org-get-outline-path)))
+		  (s-join "/" outline-path)
+		"Top-level headings")))
 
 (org-super-agenda--def-auto-group parent "their parent heading"
   :key-form (org-super-agenda--when-with-marker-buffer (org-super-agenda--get-marker item)

org-super-agenda.info

@@ -577,6 +577,12 @@ File: README.info,  Node: 14-pre,  Next: 13,  Up: Changelog
      message shown when the mode is enabled.  (Thanks to Liam Hupfer
      (https://github.com/hpfr).)
 
+   *Changes*
+   • Selector ‘:auto-outline-path’ puts top-level headings in a group
+     named "Top-level headings".  (#258
+     (https://github.com/alphapapa/org-super-agenda/issues/258).  Thanks
+     to Gulshan Singh (https://github.com/gsingh93) for suggesting.)
+
 
 File: README.info,  Node: 13,  Next: 12,  Prev: 14-pre,  Up: Changelog
 
@@ -834,18 +840,18 @@ Node: Why are some items not displayed even though I used group selectors for th
 Node: Why did a group disappear when I moved it to the end of the list?21178
 Node: Changelog21759
 Node: 14-pre21997
-Node: 1322557
-Node: 1224120
-Node: 11126790
-Node: 1126965
-Node: 10328549
-Node: 10228760
-Node: 10128894
-Node: 10029232
-Node: Development29337
-Node: Bugs29739
-Node: Tests30433
-Node: Credits30770
+Node: 1322829
+Node: 1224392
+Node: 11127062
+Node: 1127237
+Node: 10328821
+Node: 10229032
+Node: 10129166
+Node: 10029504
+Node: Development29609
+Node: Bugs30011
+Node: Tests30705
+Node: Credits31042
 
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