fix: recreate popup backdrop for each presentation

Sources/Conjure/ApplicationActionsController.swift

@@ -5,6 +5,7 @@ import ConjureKit
 final class ApplicationActionsController: NSViewController, NSSearchFieldDelegate {
     private let search = ActionsSearchField()
     private let background = LauncherBackground(frame: .zero)
+    private var material: NSVisualEffectView?
     private let entries = [
         ActionEntry(title: "Open", symbol: "arrow.up.forward.app", color: SunsetPalette.text),
         ActionEntry(title: "Favorite", symbol: "star", color: SunsetPalette.text),
@@ -58,11 +59,10 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
         view.layer?.shadowOpacity = 0.35
         view.layer?.shadowRadius = 14
         view.layer?.shadowOffset = NSSize(width: 0, height: -4)
-        let content = NSVisualEffectView()
-        content.material = .hudWindow
-        content.blendingMode = .behindWindow
-        content.state = .active
-        roundMaterialCorners(content, radius: 18)
+        let content = NSView()
+        content.wantsLayer = true
+        content.layer?.cornerRadius = 18
+        content.layer?.masksToBounds = true
         content.layer?.borderWidth = 0.5
         background.setAccessibilityElement(false)
         content.addSubview(background)
@@ -213,6 +213,24 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
             coveredPillAlpha = pill.alphaValue
         }
         coveredPill?.setAccessibilityHidden(true)
+        // A backdrop belongs to one presentation; do not move a cached native material
+        // between the footer Actions popup and the header provider popup.
+        material?.removeFromSuperview()
+        let backdrop = NSVisualEffectView()
+        backdrop.material = .hudWindow
+        backdrop.blendingMode = .behindWindow
+        backdrop.state = .active
+        roundMaterialCorners(backdrop, radius: 18)
+        backdrop.translatesAutoresizingMaskIntoConstraints = false
+        let content = background.superview!
+        content.addSubview(backdrop, positioned: .below, relativeTo: background)
+        NSLayoutConstraint.activate([
+            backdrop.leadingAnchor.constraint(equalTo: content.leadingAnchor),
+            backdrop.trailingAnchor.constraint(equalTo: content.trailingAnchor),
+            backdrop.topAnchor.constraint(equalTo: content.topAnchor),
+            backdrop.bottomAnchor.constraint(equalTo: content.bottomAnchor),
+        ])
+        material = backdrop
         host.layoutSubtreeIfNeeded()
         background.needsDisplay = true
         NSAnimationContext.runAnimationGroup { context in
@@ -247,6 +265,8 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
         coveredPill?.setAccessibilityHidden(false)
         if !animated {
             view.removeFromSuperview()
+            material?.removeFromSuperview()
+            material = nil
             coveredPill?.layer?.removeAllAnimations()
             coveredPill?.alphaValue = coveredPillAlpha
             coveredPill = nil
@@ -263,6 +283,8 @@ final class ApplicationActionsController: NSViewController, NSSearchFieldDelegat
             MainActor.assumeIsolated {
                 guard self.transitionGeneration == generation, self.isClosing else { return }
                 self.view.removeFromSuperview()
+                self.material?.removeFromSuperview()
+                self.material = nil
                 self.coveredPill = nil
                 self.isClosing = false
             }