This auto-formats all *.dart files in the repository outside of the
`engine` subdirectory and enforces that these files stay formatted with
a presubmit check.
**Reviewers:** Please carefully review all the commits except for the
one titled "formatted". The "formatted" commit was auto-generated by
running `dev/tools/format.sh -a -f`. The other commits were hand-crafted
to prepare the repo for the formatting change. I recommend reviewing the
commits one-by-one via the "Commits" tab and avoiding Github's "Files
changed" tab as it will likely slow down your browser because of the
size of this PR.
---------
Co-authored-by: Kate Lovett <katelovett@google.com>
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
Closes#137122
<b>Before</b>
VS Code and VS Code Insiders installed via Flatpak aren't detected
<b>After</b>
```sh
[â] VS Code (version 1.82.2)
⢠VS Code at /var/lib/flatpak/app/com.visualstudio.code/x86_64/stable/active/files/extra/vscode
⢠Flutter extension version 3.74.0
[â] VS Code (version 1.84.0-insider)
⢠VS Code at /var/lib/flatpak/app/com.visualstudio.code.insiders/x86_64/beta/active/files/extra/vscode-insiders
⢠Flutter extension version 3.75.20231002
```
Closes #137116
<b>Before</b>
VS Code Insiders installed via Snap isn't detected.
<b>After</b>
```sh
[â] VS Code (version 1.84.0-insider)
⢠VS Code at /snap/code-insiders/current/usr/share/code-insiders
⢠Flutter extension version 3.75.20231002
```
Fixes#124756 by removing the concept of `Version.unknown`.
`Version` fields that needed the ability to represent an unknown version have been made nullable. Assigning `null` to them represents an unknown version.
