[birt-dev] CheckIn:Fix bugzilla bug 191891xtab nest in another xtab does

["Mingxia Wu" <mwu@xxxxxxxxxxx>]

- Summary:
Fix bugzilla bug 191891 xtab nest in another xtab doesn't display data.[1102]

- Bugzilla Bug (s) Resolved:
191891

- Description:

The nested xtab and its parent’s xtab share a same scope, which will cause this error. So I made this fix on this scope issue, just make these two xtab with different scope but they share with same parent scope. Fix it now!

- Tests Description:

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:  

- Notes to Documentation:  

- Files Edited:
"/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/impl/query/PreparedCubeQuery.java"

- Files Added:

- Files Deleted