Package: x2goclient Version: 4.0.1.2
On Windows and Linux, the X2Go Client tray icon behaves correctly: left click: un-minimize/un-hide right click: show the context menu
However, on the Mac X2Go Client, clicking on the menu bar icon (i.e, the "tray icon") un-minimizes and then shows the context menu. In other words, it does both actions. It does so whether you left-click or right-click.
Observed on Mac OS X 10.9.1 Mavericks. Observed with both a a mid-2011 macbook air's trackpad (where 2 fingers emulates a right click) and with a 2 button mouse.