Few ideas for fluentRevealNavbar.uc.js

[emvaized]

This PR:

• Removes check pointerEvents=none on navbar button, which resulted in script not working for me on FF 115
• Changes default color of effect to browser's color of navbar button's color (--button-hover-bgcolor)
• Adds new options:
• • filterDy, which don't process mouse movements greater than {gradientSize}px from top of the screen, in order to reduce system load (default: true)
• • cacheButtons, which stores all toolbar buttons on script init and then reuses the list on each draw iteration (default: false)
• • includeUrlBar, which applies effect to url bar as well (when it's not focused) (default: true)

[aminomancer]

Pretty neat, thanks. I have some feedback, mostly nitpicks.

[aminomancer]

The code below needs to be fixed, or there is a bug when you move the mouse around the top of the page on about:config or about:preferences, etc. It's because they are in the parent process so their true event targets pass all the way up to the chrome window listener (normally the event target we see would be <browser>).

It's better if we just use MousePosTracker.

      let x = MousePosTracker._x - this.getOffset(area).left - window.scrollX;
      let y = MousePosTracker._y - this.getOffset(area).top - window.scrollY;

[emvaized]

Sorry, I didn't know about this bug, so my first thought was this check was added just for UX convenience. So now this should be handled by new getComputedStyle(el).pointerEvents == "none" check, right?

[aminomancer]

Looks pretty good, there is still some minor cleanup to do though