Avoid stray mouse-click after choosing date with calendar

[humdingerb]

Delay closing of calendar window to avoid stray clicks in list of transactions.

Fixes #132

[korli]

Maybe the SendMessage should be synchronous?

[humdingerb]

Please have a look at the latest change. That's what you meant, right?
Unfortunately, this still has the transaction list behind the calendar window receiving a click from the double-click that chose the date in the calendar. Which is weird, innit? Shouldn't the double-click only be received by the calendar view, which determines the date, then the calendar window gets closed. How does the "echo" of the double-click reach the view with the transaction list at all?

[korli]

Please have a look at the latest change. That's what you meant, right? Unfortunately, this still has the transaction list behind the calendar window receiving a click from the double-click that chose the date in the calendar. Which is weird, innit? Shouldn't the double-click only be received by the calendar view, which determines the date, then the calendar window gets closed. How does the "echo" of the double-click reach the view with the transaction list at all?

Yes. Like you I don't understand the behavior. Maybe the message isn't consumed by the window, and the next window in focus receives it. Looks like a bug in Haiku (every input coming before the focused window is closed should be discarded IMO).

[humdingerb]

I've reported the issue as https://dev.haiku-os.org/ticket/19861
I'll merge this delaying workaround for now.