Distinguish between one / double click.

Clocker/Panel/UI/TimezoneCellView.swift

@@ -198,7 +198,8 @@ class TimezoneCellView: NSTableCellView {
         Logger.log(object: nil, for: "Open Extra Options")
     }
 
-    override func mouseDown(with _: NSEvent) {
+    override func mouseDown(with event: NSEvent) {
+        if (event.clickCount == 1) {
             // Text is copied in the following format: Chicago - 1625185925
             let clipboardCopy = "\(customName.stringValue) - \(time.stringValue)"
             let pasteboard = NSPasteboard.general
@@ -208,6 +209,9 @@ class TimezoneCellView: NSTableCellView {
             window?.contentView?.makeToast("Copied to Clipboard".localized())
 
             window?.endEditing(for: nil)
+        } else if (event.clickCount == 2) {
+            //TODO: Favourite this timezone
+        }
     }
 
     override func rightMouseDown(with event: NSEvent) {