Expose AnimationNodeOneShot::mix_mode as a property

Fixes #23458.

doc/classes/AnimationNodeOneShot.xml

@@ -10,19 +10,6 @@
 		<link title="AnimationTree">$DOCS_URL/tutorials/animation/animation_tree.html</link>
 		<link title="Third Person Shooter Demo">https://godotengine.org/asset-library/asset/678</link>
 	</tutorials>
-	<methods>
-		<method name="get_mix_mode" qualifiers="const">
-			<return type="int" enum="AnimationNodeOneShot.MixMode" />
-			<description>
-			</description>
-		</method>
-		<method name="set_mix_mode">
-			<return type="void" />
-			<argument index="0" name="mode" type="int" enum="AnimationNodeOneShot.MixMode" />
-			<description>
-			</description>
-		</method>
-	</methods>
 	<members>
 		<member name="autorestart" type="bool" setter="set_autorestart" getter="has_autorestart" default="false">
 			If [code]true[/code], the sub-animation will restart automatically after finishing.
@@ -37,6 +24,8 @@
 		</member>
 		<member name="fadeout_time" type="float" setter="set_fadeout_time" getter="get_fadeout_time" default="0.1">
 		</member>
+		<member name="mix_mode" type="int" setter="set_mix_mode" getter="get_mix_mode" enum="AnimationNodeOneShot.MixMode" default="0">
+		</member>
 		<member name="sync" type="bool" setter="set_use_sync" getter="is_using_sync" default="false">
 		</member>
 	</members>

scene/animation/animation_blend_tree.cpp

@@ -371,6 +371,8 @@ void AnimationNodeOneShot::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_use_sync", "enable"), &AnimationNodeOneShot::set_use_sync);
 	ClassDB::bind_method(D_METHOD("is_using_sync"), &AnimationNodeOneShot::is_using_sync);
 
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "mix_mode", PROPERTY_HINT_ENUM, "Blend,Add"), "set_mix_mode", "get_mix_mode");
+
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "fadein_time", PROPERTY_HINT_RANGE, "0,60,0.01,or_greater"), "set_fadein_time", "get_fadein_time");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "fadeout_time", PROPERTY_HINT_RANGE, "0,60,0.01,or_greater"), "set_fadeout_time", "get_fadeout_time");