`textual.app.RenderResult` is being flagged as an invalid type

[davep]

With Textual 0.86.3 at least mypy and upright are reporting textual.app.RenderResult as being an invalid type. For example:

is flagged via pyright, and while type checking an application of mine mypy complains:

rye run mypy --scripts-are-modules --strict src/
src/quizzical/app/widgets/logo.py:38: error: Variable "textual.app.RenderResult" is not valid as a type  [valid-type]
src/quizzical/app/widgets/logo.py:38: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
src/quizzical/app/widgets/question_counts.py:68: error: Variable "textual.app.RenderResult" is not valid as a type  [valid-type]
src/quizzical/app/widgets/question_counts.py:68: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
Found 2 errors in 2 files (checked 25 source files)
make: *** [stricttypecheck] Error 1

---

Textual Diagnostics

Versions

Name	Value
Textual	0.86.3
Rich	13.9.4

Python

Name	Value
Version	3.12.4
Implementation	CPython
Compiler	Clang 18.1.8
Executable	/Users/davep/develop/python/quizzical/.venv/bin/python3

Operating System

Name	Value
System	Darwin
Release	24.1.0
Version	Darwin Kernel Version 24.1.0: Thu Oct 10 21:03:11 PDT 2024; root:xnu-11215.41.3~2/RELEASE_ARM64_T6020

Terminal

Name	Value
Terminal Application	iTerm.app (3.5.10)
TERM	xterm-256color
COLORTERM	truecolor
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=154, height=57
legacy_windows	False
min_width	1
max_width	154
is_terminal	True
encoding	utf-8
max_height	57
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

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