trigger-editing-menu.swift

    private var constantFloatSelection = NSMakeRange(0, 0)
    
    public override func beginFloatingCursor(at point: CGPoint) {
        // remember how it starts out
        constantFloatSelection = selectedRange
        
        super.beginFloatingCursor(at: point)
    }

    public override func updateFloatingCursor(at point: CGPoint) {
        // if selection changes during float we set it to something invalid to make
        // sure we don't change it back to the old value
        if constantFloatSelection != selectedRange {
            constantFloatSelection = NSMakeRange(NSNotFound, 0)
        }
        
        super.updateFloatingCursor(at: point)
    }

    public override func endFloatingCursor() {
        if constantFloatSelection == selectedRange {
            showMenuFromSelection()
        }
        
        super.endFloatingCursor()
    }