[Lazarus] Lazarus implementation of TListView etc?

[Michael Schnell]

For the record:

I verified that with the gtk2 (Linux) Widget type, "PostMessage()" uses 
a different Event Queue ("TGTKMessageQueue") than "TThread.Queue()" and 
TThread.Synchronize()".

So for this, calling "CheckSynchronize() will not help. You need to use 
the appropriate GUI-based Widget type.

Application.QueuAsyncCall() uses yet an additional Event Queue. Here 
using a WidgetType is not strictly necessary, but calling 
"CheckSynchronize() will not help, either. Here, TApplication provides 
"RemoveAsyncCalls()" which in a GUI Bases Widget Type is called in 
"Forms". As a non-GUI Project does not have Forms, RemoveAsyncCalls() 
needs to be called by a different functionality.

-Michael