BBcode doesn't work well if the markers are closed in reverse order

[qarmin]

Godot version:
3.1 9e62826

OS/device including version:
Windows 10

Issue description:
When my BBcode in RichTextLabel is like below, everything works as I expect:

[center][color=green]Ziemniakq[/color][/center]

but when I change text to this, then strange text after my text appear

[center][color=green]Ziemniakq[/center][/color]

Minimal reproduction project:
Test.zip

[slapin]

But why do you close tags out of order?

[Zireael07]

BBcode on forums doesn't care about order, and it's an easy enough mistake to make.

[slapin]

Well, forums run on servers with many gigabytes of RAM and many GHz CPUs, and general developers are much more disciplined. I doubt making fuzzy parser for bbcode worth the gain at all. Just my personal opinion.

[tom-jk]

State of this issue: since 3.2, the MRP with reversed close tags produces "Ziemnikq[/center]", which is a fair improvement on 3.1.

[akien-mga]

Yes that seems correct to me, unless we aim to explicitly support closing tags in random order, but I don't think it's necessary.