multiline search result view duplicates

[rebornix]

Re #62102

System: Ubuntu 18.04

• Open VSCode repo
• Search ;\n\t* with regex mode
• The result view shows duplicated content

In image above, the search found 'use strict'; correctly but the result view is displaying 'use strict'use strict'use strict';

[roblourens]

Also this (@gregvanl) now I can repro

[roblourens]

There are at least a couple different issues but it's too hard to pick them apart so I'm calling this the master issue of these weird search results.