Fix ASTextNode2 is accessing backgroundColor off main while sizing / layout is happening

[maicki]

Fixes #767

We can add the background only if we really prepare the attributed string only for drawing. We are calculating the layout without background color now and use it for sizing of the node that in the end will draw the attributed string with background color. Background color should not the influence the size though.

[ghost]

🚫 CI failed with log

[ghost]

	2 Warnings
⚠️	Any source code changes should have an entry in CHANGELOG.md or have #trivial in their title.
⚠️	Please ensure license is correct for ASTextNode2.mm: // // ASTextNode2.mm // Texture // // Copyright (c) 2014-present, Facebook, Inc. All rights reserved. // This source code is licensed under the BSD-style license found in the // LICENSE file in the /ASDK-Licenses directory of this source tree. An additional // grant of patent rights can be found in the PATENTS file in the same directory. // // Modifications to this file made after 4/13/2017 are: Copyright (c) through the present, // Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 //

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[Adlai-Holler]

Good fix 👍

[jinlee]

awesome! 👍