Fix duplication checking with menu items for shortcuts with a Shift m…

…odifier (#88)

Co-authored-by: Sindre Sorhus <[email protected]>

Sources/KeyboardShortcuts/Shortcut.swift

@@ -112,9 +112,17 @@ extension KeyboardShortcuts.Shortcut {
 	*/
 	func menuItemWithMatchingShortcut(in menu: NSMenu) -> NSMenuItem? {
 		for item in menu.items {
+			var keyEquivalent = item.keyEquivalent
+			var keyEquivalentModifierMask = item.keyEquivalentModifierMask
+
+			if modifiers.contains(.shift) {
+				keyEquivalent = keyEquivalent.lowercased()
+				keyEquivalentModifierMask.insert(.shift)
+			}
+
 			if
-				keyToCharacter() == item.keyEquivalent,
-				modifiers == item.keyEquivalentModifierMask
+				keyToCharacter() == keyEquivalent,
+				modifiers == keyEquivalentModifierMask
 			{
 				return item
 			}