search-in-workspace: add support for multi-line searches

[vince-fugnitto]

Feature Description:

The goal is to add support for multi-line searches in the search-in-workspace view.
The changes likely include:

• updating the input to a textarea
• passing the proper options to ripgrep

vscode above - theia below:

How to test:

1. search the following in the search-in-workspace view:

export const GettingStartedCommand = {
    id: GettingStartedWidget.ID,
    label: GettingStartedWidget.LABEL
};

[KR155E]

I have implemented this feature and am almost ready to submit a PR. But there's one remaining issue I can't quite get to the bottom of. For opened files, only the first line of a multiline search is being returned as the search result. Do you have an idea what might be causing this?

[vince-fugnitto]

@KR155E the opened files are handled separately since we cannot rely on their disk content given that there might be unsaved changes. We therefore search the in-memory editor model. You may be interested in the following:

• searchActiveEditor
• searchInOpenEditors
• searchInEditor

and probably most importantly:

• findMatches

[KR155E]

I see, makes a lot of sense.

lineText in findMatches will always return only the first line of a match. Modifying that got things working correctly. I will see if I can clean up the code and will then submit a PR.

Thanks for the help!