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Summary: Text in Nodes is squashed into a single DrawCommand for drawing a Boring or StaticLayout. Touch is handled using a TextNodeRegion subclass of NodeRegion that knows how to identify pieces of text inside of the DrawCommand based on spans in the text. However, we only use a TextNodeRegion on the second call for updateNodeRegion for an RCTText. If there is only one call, the NodeRegion will just be a normal one. This patch ensures that the NodeRegion for an RCTText is always a TextNodeRegion, allowing for null Layouts that are set when the DrawCommand is made. Reviewed By: astreet Differential Revision: D3291682