Remove extension on input command

[jojo2357]

Fix #2745

Summary of additions and changes

• Added input to the list of commands that have an illegal extension.

I also stumbled across a really annoying bug, wherein if the extension was implied before creating a new file, then you can't undo the process, but if an necessary extension was present, then undoing is possible.

I have no idea why.

\input{otherfile.tex} % will drop the tex

\input{otherfile}

[PHPirates]

Hm yeah it is a bit inconsistent to have \include there but not \input, I don't think there was any reason for that

[jojo2357]

simple fixes ftw. i will update the unit test to account for the new expected behavior

[jojo2357]

Build failed

How!? I changed two lines 😑

[PHPirates]

Looks like a network error or something:

2022-11-14T08:48:03.9130977Z com.intellij.openapi.externalSystem.model.ExternalSystemException: Could not download xz-1.9.jar

I'll trigger a rerun.