Bugfix [#26505] zoom in selected keys on graph editor

Not really a "bug", but it was on my todo anyways. Based on patch
[#26508] by Campbell, with a few modifications including extending
this to the Action/DopeSheet editor too.

release/scripts/ui/space_graph.py

@@ -100,6 +100,7 @@ class GRAPH_MT_view(bpy.types.Menu):
         layout.separator()
         layout.operator("graph.frame_jump")
         layout.operator("graph.view_all")
+        layout.operator("graph.view_selected")
 
         layout.separator()
         layout.operator("screen.area_dupli")