Add: (org-super-agenda-header-prefix)

Closes #108.  Thanks to Christian Schwarzgruber (@cslux).

README.org

@@ -247,6 +247,7 @@ As explained in the usage instructions and shown in the example, items are colle
 +  To-do keyword faces are applied to keywords in group headers.
 +  Option =org-super-agenda-header-separator= may also be a character, which is automatically repeated to the window width.  (Thanks to [[https://github.com/sheepduke][YUE Daian]].)
 +  Option =org-super-agenda-header-properties=.  It sets =org-agenda-structural-header= by default, which enables navigating to headers with the default =M-{= / =M-}= bindings in agenda buffers.  (Thanks to [[https://github.com/haji-ali][Abdul-Lateef Haji-Ali]].)
++  Option =org-super-agenda-header-prefix=, a string prepended to group headers.  ([[https://github.com/alphapapa/org-super-agenda/issues/108][#108]].  Thanks to [[https://github.com/cslux][Christian Schwarzgruber]].)
 
 *Changed*
 +  Group headers face is now appended to face list instead of overriding it.

org-super-agenda.el

@@ -200,6 +200,10 @@ If a string, a newline is added.  If a character, it is repeated
 to fill window width, and a newline is added."
   :type '(choice character string))
 
+(defcustom org-super-agenda-header-prefix " "
+  "String prepended to group headers."
+  :type 'string)
+
 (defcustom org-super-agenda-date-format "%e %B %Y"
   "Format string for date headers.
 See `format-time-string'."
@@ -288,7 +292,7 @@ face `org-super-agenda-header' appended, and the text properties
                           (character (concat (s-repeat (window-width) org-super-agenda-header-separator)
                                              "\n"))
                           (string org-super-agenda-header-separator))))
-         (setq s (concat " " s))
+         (setq s (concat org-super-agenda-header-prefix s))
          (add-face-text-property 0 (length s) 'org-super-agenda-header t s)
          (org-add-props s org-super-agenda-header-properties
            'keymap org-super-agenda-header-map

org-super-agenda.info

@@ -574,6 +574,10 @@ File: README.info,  Node: 12-pre,  Next: 111,  Up: Changelog
      org-agenda-structural-header by default, which enables navigating
      to headers with the default M-{ / M-} bindings in agenda buffers.
      (Thanks to Abdul-Lateef Haji-Ali (https://github.com/haji-ali).)
+   • Option org-super-agenda-header-prefix, a string prepended to group
+     headers.  (#108
+     (https://github.com/alphapapa/org-super-agenda/issues/108).  Thanks
+     to Christian Schwarzgruber (https://github.com/cslux).)
 
    *Changed*
    • Group headers face is now appended to face list instead of
@@ -766,16 +770,16 @@ 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?19848
 Node: Changelog20423
 Node: 12-pre20646
-Node: 11122998
-Node: 1123171
-Node: 10324743
-Node: 10224954
-Node: 10125088
-Node: 10025426
-Node: Development25531
-Node: Bugs25933
-Node: Tests26586
-Node: Credits26905
+Node: 11123227
+Node: 1123400
+Node: 10324972
+Node: 10225183
+Node: 10125317
+Node: 10025655
+Node: Development25760
+Node: Bugs26162
+Node: Tests26815
+Node: Credits27134
 
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