[Lazarus] Message Loop paused when no interaction with mouse?

[Bernd]

2011/4/20 Henry Vermaak <henry.vermaak at gmail.com>:

> It's a windows thing.  More info here:
>
> http://lazarus-dev.blogspot.com/2008/01/new-0926-features-part-1-sendmessage.html

This mentions gtk and qt too but unfortunately not where to find it¹.

I have found a PostMessage() function defined by lclintf but  now I'm
still searching for the LM_USER that is mentioned there, also without
any reference where it is defined.

__
¹) some kind of search index or list of all procedures that are
defined in any of the standad units would really be helpful. Each time
somebody mentions the name of a procedure or a class that would solve
some problem I find myself grepping though the entirety of FPC and LCL
sources until I find it.