[MC-137706] Selecting obfuscated text in book crashes the game

The bug

When you edit the book and attempt to select part of text that is obfuscated, the game crashes.

Crash report

18w43b: [^crash-2018-10-24_22.27.19-client.txt]

Description: Rendering screen

java.lang.StringIndexOutOfBoundsException: String index out of range: 35
	at java.lang.String.substring(String.java:1951)
	at cor.m(SourceFile:670)
	at cor.a(SourceFile:614)
	at cxp.a(SourceFile:795)
	at cjj.c(SourceFile:817)
	at cjj.a(SourceFile:380)
	at net.minecraft.client.main.Main.main(SourceFile:144)

How to reproduce

Open book and quill
Paste § to the book and add the letter 'k'
Continue writing, the text should consist just from randomly changing characters
Try to select obfuscated text

Linked issues

is duplicated by 1

MC-137924 book and quill - When using §k the text becomes misaligned to the cursor and deleting from the end caused a crash Resolved

relates to 2

MC-138046 Book and quill does not accept formatting character Resolved

MC-149792 Client book length mismatch resulting in crash Resolved

Attachments

crash-2018-10-24_22.27.19-client.txt

Comments 3

marcono1234 2018-10-24T22:33:10Z

When I try to paste the § character in the book it appears to be ignored. Is there something special to consider?

[Mod] Neko 2018-10-25T00:11:13Z

Can confirm when pasting §, then typing 'k', then adding text and selecting it.

Rikard Herlitz 2018-10-25T07:55:27Z

You are not supposed to be able to add the § symbol and styling yet at all, so that's the bug. It will be prevented in the upcoming snapshot until we implement proper component-based styling.