feat: add window display delay as a preference

alt-tab-macos/logic/Preferences.swift

@@ -17,6 +17,7 @@ struct PreferencesDecodable: Decodable {
     let metaModifierFlagInt: UInt?
     let highlightColorString : String?
     let thumbnailQuality : UInt?
+    let windowDisplayDelay: Int?
 }
 
 func fileLines(_ url: URL) throws -> Int {
@@ -79,6 +80,8 @@ class Preferences: Decodable {
     static let thumbnailQuality = NSImageInterpolation.init(rawValue: decoded?.thumbnailQuality ?? 3) ?? .high
     // NSEvent.ModifierFlags (e.g. control=262144, command=1048576, shift=131072, option=524288)
     static let metaModifierFlag = NSEvent.ModifierFlags(rawValue: decoded?.metaModifierFlagInt ?? 262144)
+    // delay (in ms) before the window is displayed after the shortcut is pressed
+    static let windowDisplayDelay = DispatchTimeInterval.milliseconds(decoded?.windowDisplayDelay ?? 200)
     // color for the currently selected cell
     static let highlightColor = NSColor.white
     // derived properties

alt-tab-macos/resources/preferences.json

@@ -13,5 +13,6 @@
   "metaKey": 59,
   "metaModifierFlagInt": 262144,
   "highlightColorString": "white",
-  "thumbnailQuality": 4
+  "thumbnailQuality": 4,
+  "windowDisplayDelay": 200
 }

alt-tab-macos/ui/Application.swift

@@ -180,7 +180,7 @@ class Application: NSApplication, NSApplicationDelegate, NSWindowDelegate, NSCol
                     Application.shared.unhideWithoutActivation()
                 }
                 workItems.append(workItem)
-                DispatchQueue.main.asyncAfter(deadline: .now() + 0.2, execute: workItem)
+                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Preferences.windowDisplayDelay, execute: workItem)
             } else {
                 highlightThumbnail(step)
             }