RichTextLabel - BBcode separates words for purpose of text-wrapping

[Schazzwozzer]

Godot version:
Godot 3.1.1 64-bit, both Standard and Mono

OS/device including version:
Windows 10 Home 64-bit, build 18362

Issue description:
While working on a solution for the gradual reveal of GUI text (an example), it's become apparent that the RichTextLabel node treats bbcode tags as white space when it comes to text wrapping.

In the above example, a color tag is programmatically moved forward within the text string. The text should not be shifting around at all.

Steps to reproduce:
Create a RichTextLabel node, enable BBCode, and insert some text, with bbcode tags in the middle of words. Play with the width of the control rect, and the issue should become apparent. Alternately, download the repro project, which was used to produce the above gif.

Minimal reproduction project:
Text Reveal Bug.zip