The app is crashing when tapping in the middle of some tab characters in a TextField.

Related:
flutter/engine#8591
#30173

Steps to Reproduce

1. In any TextField, enter some text, a few tab characters, and then some more text.
2. Tap in the middle of the tab characters to attempt to place the cursor there.
3. Crash!

Note that most software keyboards don't have a tab key. You'll need to use a physical keyboard (with a simulator or real device), or install a keyboard with tab, like the Keyboard for Excel.

Logs

Unfortunately I don't get a full stack trace, just this:

[VERBOSE-3:opacity_layer.cc(16)] Check failed: layers().size() > 0.