- more Unicode conversion

- Avoid playing games with focus in a newly created thread, that leads
  to all kinds of misbehaviours and failures in window activation
  under Windows.

we should use the SND_DSP_POST ioctl to let the sound card know to
flush those fragments.  This allows us to precisely know when the
buffer is empty, and fixes another set of winmm tests.

demand WAVE_FORMAT_DIRECT; this fixes another slew of tests.

adjust when calculating TIME_SAMPLES.

room in a header item and an image from an imagelist is displayed on
the right of the text.

create_empty_region instead.

regardless of the window rectangle.

Don't repaint on hover if 'hot tracking' isn't on.

account.

- convert IShellFolder::ParseDisplayName to use Unicode

groundwork to be able to start processing uninstall logic as well.

scrollbars if there is not enough space for it anyway. With tests to
confirm the behavior.

handler didn't do it.

Tests to confirm this behaviour.

match native.