I was adding mode-specific placeholder text in opencode, such that shell mode shows a relevant bash example rather than the normal prompt example.

That exposed a rendering bug in OpenTUI: when switching from the longer normal-mode placeholder to the shorter shell-mode placeholder, trailing characters from the old placeholder stayed visible. Example:

1. Build mode placeholder (all good)

2. When switching to bash mode (OH NO! DEAR GOD NO!)

As you can see, the last bits of "Fix broken tests" aren't cleared as one might expect, leaving us with the hideous: Run a command... "pwd"roken tests