Cleanup unused mouse tracking code.

Clocker/Panel/Rate Controller/UpcomingEventView.swift

@@ -2,38 +2,6 @@
 
 import Cocoa
 
-class UpcomingEventView: NSView {
-    private var trackingArea: NSTrackingArea?
-
-    override func mouseEntered(with event: NSEvent) {
-        super.mouseEntered(with: event)
-        let dismissalButton = subviews.filter { $0.tag == 55 }.first
-        if let firstMatch = dismissalButton, firstMatch.isHidden {
-            firstMatch.isHidden = false
-        }
-    }
-
-    override func mouseExited(with event: NSEvent) {
-        super.mouseExited(with: event)
-        let dismissalButton = subviews.filter { $0.tag == 55 }.first
-        if let firstMatch = dismissalButton, !firstMatch.isHidden {
-            firstMatch.isHidden = true
-        }
-    }
-
-    override func updateTrackingAreas() {
-        super.updateTrackingAreas()
-
-        if let trackingArea = self.trackingArea {
-            removeTrackingArea(trackingArea)
-        }
-
-        let options: NSTrackingArea.Options = [.mouseEnteredAndExited, .activeAlways]
-        let trackingArea = NSTrackingArea(rect: bounds, options: options, owner: self, userInfo: nil)
-        addTrackingArea(trackingArea)
-    }
-}
-
 class ModernSliderContainerView: NSView {
     private var trackingArea: NSTrackingArea?
     public var currentlyInFocus = false