Fix Quick Look when window is inactive on completion (#107)

Gifski/ConversionCompletedViewController.swift

@@ -41,6 +41,9 @@ final class ConversionCompletedViewController: NSViewController {
 	override func viewDidAppear() {
 		super.viewDidAppear()
 
+		// This is needed for Quick Look to work.
+		self.view.window?.makeFirstResponder(self)
+
 		if #available(macOS 10.14, *), defaults[.successfulConversionsCount] == 5 {
 			SKStoreReviewController.requestReview()
 		}

Gifski/ConversionViewController.swift

@@ -42,14 +42,20 @@ final class ConversionViewController: NSViewController {
 		view = wrapper
 	}
 
-	override func viewDidLoad() {
-		super.viewDidLoad()
+	override func viewDidAppear() {
+		super.viewDidAppear()
+
+		view.window?.makeFirstResponder(self)
 
 		start(conversion: conversion)
 	}
 
 	/// Gets called when the Esc key is pressed.
-	/// Reference: https://stackoverflow.com/a/42440020
+	override func cancelOperation(_ sender: Any?) {
+		cancelConversion()
+	}
+
+	// TODO: Remove this when we target macOS 10.14.
 	@objc
 	func cancel(_ sender: Any?) {
 		cancelConversion()

Gifski/util.swift

@@ -2449,7 +2449,6 @@ extension NSViewController {
 		}, completionHandler: {
 			window.contentViewController = viewController
 			viewController.view.animator().alphaValue = 1.0
-			window.makeFirstResponder(viewController)
 			completion?()
 		})
 	}