Column heading context menu should stick

[humdinger]

This is hrev33939.

The context menus on the headings of attribute columns in Tracker list views should behave exactly like any other menu:

• It should stay open when it is single clicked until an entry is selected, which closes it automatically.
• If you click and hold, you can navigate to an entry, release the mouse button and the menu closes automatically.

At the moment, only the latter works.

Of course, having a method to select more than one entry without having the menu close automatically, would be desirable for the whole menu system. Think of starting several apps from Deskbar or going through several fonts in an wordprocessor. That's a separate topic, however.

[diver]

Probably fixed in hrev40142.