CurvesInterpolationUI : Fix DocumentationTest failures

Treating OptionalValuePlug as a terminal is consistent with the way we treat NameValuePlug. With that done, promoting the documentation from the `value` plug fixes the test failure, but also makes the tooltip available more easily in the UI, without having to turn the `enabled` switch on.

Author: johnhaddon

python/GafferSceneUI/CurvesInterpolationUI.py

@@ -56,7 +56,7 @@
 
 	plugs = {
 
-		"basis.value" : {
+		"basis" : {
 
 			"description" :
 			"""
@@ -71,6 +71,10 @@
 			  to the end vertices.
 			""",
 
+		},
+
+		"basis.value" : {
+
 			"plugValueWidget:type" : "GafferUI.PresetsPlugValueWidget",
 			# We only expose the basis types which have a step of 1.
 			# We can safely convert between any of these without them
@@ -81,7 +85,7 @@
 
 		},
 
-		"wrap.value" : {
+		"wrap" : {
 
 			"description" :
 			"""
@@ -95,6 +99,10 @@
 			  phantom endpoints. Generally inferior to the other options.
 			""",
 
+		},
+
+		"wrap.value" : {
+
 			"plugValueWidget:type" : "GafferUI.PresetsPlugValueWidget",
 			"preset:Pinned" : IECoreScene.CurvesPrimitive.Wrap.Pinned,
 			"preset:Periodic" : IECoreScene.CurvesPrimitive.Wrap.Periodic,

python/GafferTest/TestCase.py

@@ -308,6 +308,7 @@ def __undocumentedPlugs( self, node, additionalTerminalPlugTypes = () ) :
 			Gaffer.Box2fPlug, Gaffer.Box3fPlug,
 			Gaffer.TransformPlug, Gaffer.Transform2DPlug,
 			Gaffer.CompoundDataPlug.MemberPlug,
+			Gaffer.OptionalValuePlug,
 			additionalTerminalPlugTypes
 		)