fix: sharper images on non-retina displays

src/api-wrappers/HelperExtensions.swift

@@ -161,3 +161,15 @@ extension NSControl {
         }
     }
 }
+
+extension NSImage {
+    // copy and resize an image using high quality interpolation
+    func resizedCopy(_ width: CGFloat, _ height: CGFloat) -> NSImage {
+        let img = NSImage(size: CGSize(width: width, height: height))
+        img.lockFocus()
+        NSGraphicsContext.current?.imageInterpolation = .high
+        draw(in: NSMakeRect(0, 0, width, height), from: NSMakeRect(0, 0, size.width, size.height), operation: .copy, fraction: 1)
+        img.unlockFocus()
+        return img
+    }
+}

src/ui/FeedbackWindow.swift

@@ -26,8 +26,8 @@ class FeedbackWindow: NSWindow {
     }
 
     private func setupView() {
-        let appIcon = NSImageView(image: App.shared.applicationIconImage)
-        appIcon.fit(80, 80)
+        let appIcon = NSImageView(image: NSImage(named: "app-icon")!.resizedCopy(80, 80))
+        appIcon.imageScaling = .scaleNone
         let appText = NSStackView(views: [
             BoldLabel(NSLocalizedString("Share improvement ideas, or report bugs", comment: "")),
             HyperlinkLabel(NSLocalizedString("View existing discussions", comment: ""), App.repository + "/issues"),

src/ui/preferences-window/tabs/AboutTab.swift

@@ -6,8 +6,8 @@ class AboutTab: NSObject {
     }
 
     static func makeView() -> NSGridView {
-        let appIcon = NSImageView(image: App.shared.applicationIconImage)
-        appIcon.fit(150, 150)
+        let appIcon = NSImageView(image: NSImage(named: "app-icon")!.resizedCopy(150, 150))
+        appIcon.imageScaling = .scaleNone
         let appText = NSStackView(views: [
             BoldLabel(App.name),
             NSTextField(wrappingLabelWithString: NSLocalizedString("Version", comment: "") + " " + App.version),