[birt-dev] Checkin: fix 132506 [Regression][Linux WS]Error on operation

["Yuejie Chen" <yuejie.chen@xxxxxxxxxxx>]

- Summary: 132506
[Regression][Linux WS]Error on operation buttom in layout tab

- Bugzilla Bug (s) Resolved:
132506
- Description:
Add multipage sort algorithm in multipage extention point manager.

- Tests Description:
Manual

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:

- Notes to Documentation:

- Files Edited:

/org.eclipse.birt.report.designer.ui.editors.schematic/plugin.xml
/org.eclipse.birt.report.designer.ui.editors/schema/multiPageEditorContributor.exsd
/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/internal/ui/extension/EditorContributorManager.java
/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/internal/ui/extension/FormPageDef.java
/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/internal/ui/extension/IExtensionConstants.java
/org.eclipse.birt.report.designer.ui.lib/plugin.xml
/org.eclipse.birt.report.designer.ui.preview/plugin.xml

- Files Added:

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