Bug 484177

May be tangentially related to https://bugs.kde.org/show_bug.cgi?id=484023

When using a blue light filter and doing colour sensitive work, I'm forced to disable Night Light entirely across all displays, when what I really want is for it to only disable the filter on one application (e.g. Krita / Figma), while continuing to filter everything else. Right now, my only option is to disable it completely, which isn't really ideal. 

Additionally, sometimes I don't realise the filter is on at all, especially near sunset when it is gradually changing temperature, which can be problematic for colour sensitive work.

Some use cases:
- I'm playing a video game or watching a movie at night, and I have Discord or a web browser open on a second monitor
- I'm working on a project, and my text editor should stay filtered, but the preview and Figma should not be

What a perfect implementation would look like for me:
- Still scheduled to turn transition on at sunset, with denied windows never being filtered
- Denylist override ("filter everything, except these applications and windows")
- (I suppose some people may also want an allowlist mode, even though I wouldn't use it? "filter nothing, except these applications and windows")

tl;dr: Option to exclude certain windows from Night Light.