Animation: Add Operator for adding FCurve modifiers to more menus

The operator has the option to add to selected FCurves instead
of only the active, but it was only exposed in the redo panel.
This patch adds the operator to the right-click menu on FCurve channels,
and to the channel menu in the Graph editor.
Both times with configured to add to selected
instead of only the active FCurve

Revied by Reviewed by: Sybren A. Stüvel
Differential Revision: https://developer.blender.org/D17066
Ref: D17066

release/scripts/startup/bl_ui/space_dopesheet.py

@@ -708,6 +708,9 @@ class DOPESHEET_MT_channel_context_menu(Menu):
             operator = "action.extrapolation_type"
         layout.operator_menu_enum(operator, "type", text="Extrapolation Mode")
 
+        if is_graph_editor:
+            layout.operator_menu_enum("graph.fmodifier_add", "type", text="Add F-Curve Modifier").only_active = False
+
         layout.separator()
         layout.operator("anim.channels_expand")
         layout.operator("anim.channels_collapse")

release/scripts/startup/bl_ui/space_graph.py

@@ -222,6 +222,7 @@ class GRAPH_MT_channel(Menu):
         layout.separator()
         layout.operator("anim.channels_editable_toggle")
         layout.operator_menu_enum("graph.extrapolation_type", "type", text="Extrapolation Mode")
+        layout.operator_menu_enum("graph.fmodifier_add", "type", text="Add F-Curve Modifier").only_active = False
 
         layout.separator()
         layout.operator("graph.hide", text="Hide Selected Curves").unselected = False