VSCodeAPI 'showInformationMessage' do not support newlines. (\n)

[raphaelsantos]

Description

It should be possible for users to call showInformationMessage (VS Code API) with newlines included (\n). The following does not work for notification messages, but does work when passing MessageOption modal as true.

Reproduction Steps

1. create a simple vscode extension which calls showInformationMessage passing modal: true and include newlines in the message.

Ex:

vscode.commands.registerCommand('extension.showModalMessage', () => {
  vscode.window.showInformationMessage('Hello World!\nHello World!\nHello World!', { modal: true });
})

OS and Theia version:

10.14.6
0.12.0

[vince-fugnitto]

@raphaelsantos are you certain it is supported in vscode?
I performed the following call in my extension, and the result was without newlines:

vscode.window.showInformationMessage('t\ne\ns\nt');

Also, looking at their source code and past discussions, it looks like newlines aren't supported:

• vscode code
• Javascript injection via notification messages #7283 (comment)

[vince-fugnitto]

@raphaelsantos can you provide an example of a showInformationMessage extension which works in VS Code and not Theia?

[vince-fugnitto]

@raphaelsantos are you certain it is supported in vscode?

@raphaelsantos can you provide an example of a showInformationMessage extension which works in VS Code and not Theia?

Please re-open the issue once the questions have been answered.
Based on findings it does not look like VS Code supports newlines either.

[raphaelsantos]

Hi @vince-fugnitto , I'm really sorry for taking all this time to answer.

Entering newline with \n actually works when calling showInformationMessage with MessageOptions {modal:true} on VSCode, but does not work on Theia.

[vince-fugnitto]

Hi @vince-fugnitto , I'm really sorry for taking all this time to answer.

Entering newline with \n actually works when calling showInformationMessage with MessageOptions {modal:true} on VSCode, but does not work on Theia.

No problem, thanks for getting back!
I confirmed it works for the modal dialog, I'll update the issue description to reflect that.