fix: center progress thumb on pointer while seeking

Sources/App/TerebiApp.swift

@@ -2008,17 +2008,14 @@ private struct PlaybackSlider: NSViewRepresentable {
             let width = bar.width - cell.knobThickness
             guard width > 0, maxValue > minValue else { return }
             let point = convert(event.locationInWindow, from: nil)
-            let knob = cell.visibleKnobRect(cell.knobRect(flipped: isFlipped))
-            let grabbed = NSBezierPath(roundedRect: knob, xRadius: 1, yRadius: 1).contains(point)
-            let offset = grabbed ? point.x - knob.midX : 0
             func seek(_ x: CGFloat) {
-                let fraction = min(1, max(0, (x - offset - start) / width))
+                let fraction = min(1, max(0, (x - start) / width))
                 let value = minValue + fraction * (maxValue - minValue)
                 guard value != doubleValue else { return }
                 doubleValue = value
                 if let action { sendAction(action, to: target) }
             }
-            if !grabbed { seek(point.x) }
+            seek(point.x)
             while let next = window?.nextEvent(matching: [.leftMouseDragged, .leftMouseUp]) {
                 let nextPoint = convert(next.locationInWindow, from: nil)
                 if next.type == .leftMouseDragged || nextPoint.x != point.x { seek(nextPoint.x) }
@@ -2130,12 +2127,9 @@ func playbackSliderHitCheck() -> Bool {
         }
         slider.mouseDown(with: down)
         let movedKnob = cell.knobRect(flipped: slider.isFlipped)
-        let expectedMovement = movement + (abs(offset) <= 1 ? 0 : offset)
+        let expectedMovement = movement + offset
         let expectedX = min(right, max(left, knob.midX + expectedMovement))
         guard abs(movedKnob.midX - expectedX) < 0.5 else { return false }
-        if abs(offset) <= 1 && movement == 0 {
-            guard slider.doubleValue == initial else { return false }
-        }
     }
     return true
 }