OverlayMask does not always handle setting it's positioning correctly

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.0.1
• Fix Version/s: 1.0.2
• Component/s: Overlay
• Labels: None
• Similar Issues: Show 5 results ; ;

  AUI-263	OverlayMask does not display in Opera in Dialog or Image Viewer
  AUI-271	OverlayMask does not properly mask document in Opera
  AUI-746	IE6: Tooltip arrow does not align correctly
  AUI-292	scrollbar position affects mask height for aui-image-viewer-gallery
  AUI-112	constrain2view option on Dialog is always setting to true

OverlayMask has some bugs in it that cause it to sometimes render improperly.
1. It uses 2 semi-global variables to check if the target of the overlay is the window or the document. However, the target can be different across multiple overlay masks, so these values should be per instance.
2. The _uiSetXY method gets called during the sync phase, and if the page is scrolled when the sync phase happens, it will calculate the scrolled XY. However, when it's a full page overlaymask, we shouldn't bother setting the XY (it will always be 0,0).