First click on BMenuBar will show empty MenuWindow

[diver]

First click on BMenuBar will show empty BPopUpMenu list, half second later menu items will appear.

[jackburton]

First click on any menubar causes a new BWindow to be created, maybe that's what is taking so much time ? By the way, On real hardware or emulated ? I definitely can see this on vmware.

[diver]

It's on real hardware with supported nvidia card.

[jackburton]

So we have to find out why it's taking so much time to create the menu window.

[jackburton]

I might have found out what's happening: BMenu::AttachedToWindow() calls get_key_map(). get_key_map() calls control_input_server(). If it's the first time that application calls that method, a BMessenger is created using this constructor: BMessenger(const char *signature) (it's cached later), and that might be the reason for the slow start (and not the window creation as I said before, as the window is obviously shown on screen immediately).

[jackburton]

I just tried removing that call but the problem is still there...

[jackburton]

Reassign to Axel, because the culprit seems to be windows creation + first show. Feel free to reassign it to me if you find out it's not the case.