gdiplus: get_font_hfont() should ask gdi32 to match font height against the character height instead of cell height.

winemac: Cope with apps which return multiple DROPEFFECTs from IDropTarget::DragEnter() and DragOver().

Only clicks on the title bar (outside the close or minimize buttons) or the
grow box give windows focus.

wined3d: Avoid the position_float4() fixup if the vertex pipe can handle pre-transformed vertices itself.