registering filters.
Fixed default category when RegisterFilter is called without one
specified.

- Partially implement the PSH_WIZARDCONTEXTHELP and PSH_NOCONTEXTHELP
  styles.

Some old code checks that _WINDEF_ is defined in windef.h.

comparison.

VARIANT in the passed pointer. Added testcase.

inherited by derived handles.

- More A->W conversions missed by previous patch.
- Fix off-by-one error in validating drag-n-drop from available
  buttons list box to actual buttons list box.
- Unicode flag should be based on the notification window.

get_visible_region, return STATUS_BUFFER_OVERFLOW instead.

AddRef and Release return ULONG.

Fix bug in effect enumeration that crashed dxcapsviewer.

Add a Marlett replacement font.

the colour table of that dib.
Added a test for this.

  tests
- add ConvertStringSidToSidA
- add missing exports for ConvertStringSidToSidA/W

colour mapping associated with a dib section - it's this table that
GetDIBColorTable should retrieve.
Added some GetDIBColorTable tests.

  button; use plain mouse capture instead like native.
- Return only HTTRANSPARENT/HTCLIENT from WM_NCHITTEST and remove
  associated hacks of WM_SETCURSOR, WM_NCLBUTTONDOWN and
  WM_NCLBUTTONUP.
- Refactor state change code so that state changes don't happen as
  side effects from messages such as WM_NCCALCSIZE, instead only from
  user input messages like WM_MOUSEMOVE.