Xterm.js: Clickable multi-line links have regressed

[Tyriar]

Upstream issue: https://github.com/microsoft/vscode/issues/61708
Old PR that solved the issue (things have changed a lot in the area though): https://github.com/xtermjs/xterm.js/pull/1769

We should verify the state of the bug before tackling this.

[kamalesh0406]

I would like to look into this

[Tyriar]

@kamalesh0406 sounds good 👍

[kamalesh0406]

I think the bug has been resolved.

[jerch]

@kamalesh0406 Multiline support in general works yeah, but there are issues with special conditions of chars:

• combining chars/wide chars in the line prior the URL (or any content to be linkified) might offset the underline (both start and end)
• combing chars/wide chars within the linkified content might offset end of underline
• on resizing the URL might contain wrong (truncated or wrongly filled in spaces) content

You might want to look at some test cases in #1769 to get a hold of those exotic conditions.

[lramos15]

Repro steps:

1. Fill terminal
2. clear
3. Execute a program which prints a link longer than the current size of the terminal.