match in-workspace? workspace-rule ?

[Bluberry-Kat]

I've been attempting to make use of niri's features for blocking windows from screen capture, but have been struggling to work around firefox.
Several web applications are critical to my workflow so this is difficult. My current-best idea was to create a named "Sensitive" workspace; theoretically I could then match windows in that workspace and they would all be blocked from capture.
Only after creating the workspace and styling it in waybar did I learn there's no way to do this at present.

(Another workaround I considered and briefly used was just keeping all my sensitive data on a monitor I never intended on capturing. This worked fine, but one of my screens is smaller than the other, being a framework 16 connected to a full size desktop monitor.)

[YaLTeR]

For this I had something closer to workspace-rule in mind (or just setting properties straight in the workspace "sensitive" { block). This is better than match is-workspace because it should avoid cycles with the open-on-workspace rule.

[Bluberry-Kat]

Sounds good to me. I can't really foresee anything a hypothetical match in-workspace could do that a workspace property couldn't anyway.

[YaLTeR]

Made an issue: #1012