Re: resize handling / layout on timeout?

On Sat, 2013-10-05 at 18:44 +0400, Ivan Timofeev wrote:
> 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"... 

Opaque resize is the now normal case where window contents are shown
while moving as opposed to old-school drawing a simple empty wireframe
box.

> But if there is a problem with the help application only, wouldn't it better to
> fix *its* resize handling?

Sounds reasonable.

> 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)

Is the print dialog ultra slow after that or is there some other
problem ?

Are you just on Linux or are you able to see what the general situation
is like on Windows/MacOSX too ?

C.