feat: avoid confusion with native app-switcher (closes #2080)

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

@@ -153,7 +153,11 @@ class ControlsTab {
             .commandShiftTab: { (shortcut) in shortcut.carbonKeyCode == kVK_Tab && combinedModifiersMatch(shortcut.carbonModifierFlags, UInt32(cmdKey | shiftKey)) },
             .commandKeyAboveTab: { (shortcut) in shortcut.carbonModifierFlags == cmdKey && shortcut.carbonKeyCode == kVK_ANSI_Grave },
         ]
-        let overlappingHotkeys = shortcuts.values.compactMap { (atShortcut) in nativeHotkeys.first { $1(atShortcut.shortcut) }?.key }
+        var overlappingHotkeys = shortcuts.values.compactMap { (atShortcut) in nativeHotkeys.first { $1(atShortcut.shortcut) }?.key }
+        // if command+tab if bound, disable command+shift+tab always, to avoid confused users
+        if overlappingHotkeys.contains(.commandTab) && !overlappingHotkeys.contains(.commandShiftTab) {
+            overlappingHotkeys.append(.commandShiftTab)
+        }
         let nonOverlappingHotkeys: [CGSSymbolicHotKey] = Array(Set(nativeHotkeys.keys).symmetricDifference(Set(overlappingHotkeys)))
         setNativeCommandTabEnabled(false, overlappingHotkeys)
         setNativeCommandTabEnabled(true, nonOverlappingHotkeys)