Merge commit '921d0574a0' as 'engine'

engine/doc/classes/AnimationNodeAdd3.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="AnimationNodeAdd3" inherits="AnimationNodeSync" api_type="core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+	<brief_description>
+		Blends two of three animations additively inside of an [AnimationNodeBlendTree].
+	</brief_description>
+	<description>
+		A resource to add to an [AnimationNodeBlendTree]. Blends two animations out of three additively out of three based on the amount value.
+		This animation node has three inputs:
+		- The base animation to add to
+		- A "-add" animation to blend with when the blend amount is negative
+		- A "+add" animation to blend with when the blend amount is positive
+		If the absolute value of the amount is greater than [code]1.0[/code], the animation connected to "in" port is blended with the amplified animation connected to "-add"/"+add" port.
+		[b]Note:[/b] The signs are only used to distinguish ports, and additive blending occurs based on absolute values always, meaning the animation of a "-add" port does not subtract from the animation of an "in" port.
+	</description>
+	<tutorials>
+		<link title="Using AnimationTree">$DOCS_URL/tutorials/animation/animation_tree.html</link>
+		<link title="Third Person Shooter (TPS) Demo">https://godotengine.org/asset-library/asset/2710</link>
+	</tutorials>
+</class>