resize handling / layout on timeout?

[Ivan Timofeev]

Hi,

looking at fdo#38814 "Snappier rendering: paint at idle, not on timeout"
  https://bugs.freedesktop.org/show_bug.cgi?id=38814
it is not clear to me why we handle resize asynchronously.

It was introduced in

http://cgit.freedesktop.org/libreoffice/core/commit/?id=fb72a53dc6ff64001cbdebbdd908b7cf71aa8723
  "#83524# buffer resize events to handle opaque resize WMs better"
only for vcl/unx/generic.

Then there was a bug
  https://issues.apache.org/ooo/show_bug.cgi?id=30571
  "VCL plugin: slow painting of help application if main window is resized"
- turned out the help app is super-slow on Resize -> the solution was to
resize on timer for *all* platforms/vcl plugins:
  http://cgit.freedesktop.org/libreoffice/core/log/?qt=grep&q=i30571

So - #83524# is dead, I don't know what is "opaque resize WM"... But if
there is a problem with the help application only, wouldn't it better to
fix *its* resize handling?

FWIW, I've disabled the resize timer (i.e. bool bStartTimer = false in
vcl/source/window/winproc.cxx) and don't see any problem so far (except
the help app).

Same for layout - I guess it can be done immediately..? (Well, the
printdialog will need some love then).

Opinions?

Regards,
Ivan