Setting show_root to True raises a KeyError

[lllama]

    def compose(self):
        dir_tree = DirectoryTree("./src/routes")
        dir_tree.show_root = True
        yield Header()
        with Horizontal():
            yield Logo()
            with TabbedContent("Config", "Routes", "Server"):
                yield Config(self.config)
                yield dir_tree
                yield Label("hello")
        yield Footer()

setting show_root to True. raises the following error:
KeyError: "No 'directory-tree--folder' key in COMPONENT_CLASSES"

Diagnose output:

Textual Diagnostics

Versions

Name	Value
Textual	0.20.1
Rich	13.3.3

Python

Name	Value
Version	3.11.0
Implementation	CPython
Compiler	Clang 14.0.0 (clang-1400.0.29.202)
Executable	/Users/felixingram/Library/Application Support/hatch/env/virtual/sanic-kit/1YPPa8fF/sanic-kit/bin/python

Operating System

Name	Value
System	Darwin
Release	22.4.0
Version	Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:41 PST 2023; root:xnu-8796.101.5~3/RELEASE_ARM64_T8103

Terminal

Name	Value
Terminal Application	WezTerm (20230326-111934-3666303c)
TERM	xterm-256color
COLORTERM	truecolor
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=203, height=46
legacy_windows	False
min_width	1
max_width	203
is_terminal	False
encoding	utf-8
max_height	46
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

[davep]

To narrow it down a wee but, this only happens if show_root is changed before the DOM is fully-loaded (for example, doing the same in on_mount is fine). Looks like watch_show_root is a bit too eager.

[github-actions]

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