Mobile iOS deletes select all code when using copy

There's no issue with small single line copy/paste. When doing select all copy the entire code gets deleted (acting like cut) and the clipboard does not retain the select all.

Reproduce this on iOS by selecting all code and using copy, then trace the mobile app's copy and selection handling. Done means select-all copy leaves the code intact and places the full selection on the clipboard, while single-line copy/paste still works.

Written by the indexing model from the issue text.