Feature Request: add command for "remove unnecessary usings"

[reimer-atb]

Issue Description

Steps to Reproduce

1. Create a C# class in VSCode
2. Add some using statements, which are not used in the code

Expected Behavior

There should be a command to trigger "remove unnecessary usings" from the command palette, like "organize imports" command for typescript files.

There should also be a way to apply this to all C# files in a folder / project.

Ideally, there would be an option in the settings to have "remove unnecessary usings" run automatically when saving a C# fle.

Actual Behavior

Unused using statements are greyed out but cannot be removed from any location in the file.
I have to scroll up to the top of the file, position the cursor on one of the unused using statements, press Command+. (on a Mac) and select "remove unnecessary usings".

This is ridiculous because most of the time, the using statements are not even visible on screen when working on the code further down the file.

Logs

OmniSharp log

Post the output from Output-->OmniSharp log here

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.37.1
C# Extension: 1.21.0

Mono Information

OmniSharp using global mono :6.0.0

Dotnet Information

.NET Core SDK (gemäß "global.json"): Version: 2.2.401 Commit: 729b316c13

Laufzeitumgebung:
OS Name: Mac OS X
OS Version: 10.14
OS Platform: Darwin
RID: osx.10.14-x64
Base Path: /usr/local/share/dotnet/sdk/2.2.401/

Host (useful for support):
Version: 2.2.6
Commit: 7dac9b1b51

.NET Core SDKs installed:
2.2.401 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.1.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
angular-console	nrwl	8.0.10
csharp	ms-vscode	1.21.0
debugger-for-chrome	msjsdiag	4.11.7
EditorConfig	EditorConfig	0.13.0
Go	ms-vscode	0.11.4
java	redhat	0.47.0
latex-workshop	James-Yu	7.3.0
markdown-all-in-one	yzhang	2.4.2
ng-template	Angular	0.802.2
vscode-boot-dev-pack	Pivotal	0.0.8
vscode-concourse	Pivotal	1.10.0
vscode-docker	ms-azuretools	0.7.0
vscode-java-debug	vscjava	0.20.0
vscode-java-dependency	vscjava	0.5.1
vscode-java-pack	vscjava	0.7.1
vscode-java-test	vscjava	0.19.0
vscode-kubernetes-tools	ms-kubernetes-tools	1.0.2
vscode-manifest-yaml	Pivotal	1.10.0
vscode-markdownlint	DavidAnson	0.30.1
vscode-maven	vscjava	0.18.1
vscode-spring-boot	Pivotal	1.10.0
vscode-spring-boot-dashboard	vscjava	0.1.6
vscode-spring-initializr	vscjava	0.4.6
vscode-typescript-tslint-plugin	ms-vscode	1.2.2
vscode-xml	redhat	0.8.0
vscode-yaml	redhat	0.4.1
vscodeintellicode	VisualStudioExptTeam	1.1.9

[rchande]

I think this is a duplicate of #1179

[reimer-atb]

@rchande there may be some overlap with #1179 but I was also asking/hoping for a command from command palette to trigger "remove unnecessary usings", as well as a preference setting to automatically trigger "remove unnecessary usings" when saving a file.

Also, from reading the comments I could not find the reason why #1179 was closed? The requested feature is not available (at least I haven't found it) but I also did not find any comment saying something like "we can't or won't implement that".

[mgsaraujo]

This feature would be so nice. 😢

[filipw]

#1245 (comment)