Pedigree View - Add Help context menu (#938)

* Add [About Pedigree View]

Fixes #10919

gramps/plugins/view/pedigreeview.py

@@ -51,6 +51,7 @@ import cairo
 from gramps.gen.lib import ChildRef, ChildRefType, Family
 from gramps.gui.views.navigationview import NavigationView
 from gramps.gui.editors import FilterEditor
+from gramps.gui.display import display_url
 from gramps.gen.display.name import displayer as name_displayer
 from gramps.gen.utils.alive import probably_alive
 from gramps.gen.utils.file import media_path_full
@@ -62,7 +63,7 @@ from gramps.gui.editors import EditPerson, EditFamily
 from gramps.gui.ddtargets import DdTargets
 from gramps.gen.config import config
 from gramps.gui.views.bookmarks import PersonBookmarks
-from gramps.gen.const import CUSTOM_FILTERS
+from gramps.gen.const import CUSTOM_FILTERS, URL_MANUAL_PAGE, URL_WIKISTRING
 from gramps.gui.dialog import RunDatabaseRepair, ErrorDialog
 from gramps.gui.utils import color_graph_box, hex_to_rgb_float, is_right_click
 from gramps.gen.constfunc import lin
@@ -75,7 +76,7 @@ from gramps.gen.utils.symbols import Symbols
 # Constants
 #
 #-------------------------------------------------------------------------
-
+WIKI_PAGE = URL_WIKISTRING + URL_MANUAL_PAGE + '_-_Categories#Pedigree_View'
 _PERSON = "p"
 _BORN = _('short for born|b.')
 _DIED = _('short for died|d.')
@@ -824,6 +825,10 @@ class PedigreeView(NavigationView):
         self._config.save()
         NavigationView.on_delete(self)
 
+    def on_help_clicked(self, dummy):
+        """ Button: Display the relevant portion of Gramps manual"""
+        display_url(WIKI_PAGE)
+
     def goto_handle(self, handle=None):
         """
         Rebuild the tree with the given person handle as the root.
@@ -1695,6 +1700,18 @@ class PedigreeView(NavigationView):
         item.show()
         menu.append(item)
 
+        # Separator.
+        item = Gtk.SeparatorMenuItem()
+        item.show()
+        menu.append(item)
+
+        # Help menu entry
+        menu.append(item)
+        item = Gtk.MenuItem(label=_("About Pedigree View"))
+        item.connect("activate", self.on_help_clicked)
+        item.show()
+        menu.append(item)
+
     def cb_build_missing_parent_nav_menu(self, obj, event,
                                          person_handle, family_handle):
         """Builds the menu for a missing parent."""