EXECUTE: Seam web project
EXECUTE: Open login.xhtml and menu.xhtml
EXECUTE: Add <s:button value="button"></s:button> in menu.xhtml
EXECUTE: Save file.
EXECUTE: Add <h:commandButton value="button"/> and don't save file.
EXECUTE: Close Studia and on Resource Save wizard select "No" button.
EXECUTE: Open Studia in the same workspace.
EXECUTE: Add <h:commandButton value="button"/> to the same place where it was before closing studia and don't save file.
EXECUTE: Close menu.xhtml and on Resource Save wizard select "No" button.
FAILURE: An internal error occurred during: "Reading saved version of file for quick diff".
java.lang.NullPointerException
at org.jboss.tools.jst.jsp.jspeditor.JSPMultiPageEditorSite.getWorkbenchWindow(JSPMultiPageEditorSite.java:150)
at org.eclipse.ui.internal.editors.quickdiff.LastSaveReferenceProvider.addElementStateListener(LastSaveReferenceProvider.java:339)
at org.eclipse.ui.internal.editors.quickdiff.LastSaveReferenceProvider.readDocument(LastSaveReferenceProvider.java:272)
at org.eclipse.ui.internal.editors.quickdiff.LastSaveReferenceProvider.access$0(LastSaveReferenceProvider.java:203)
at org.eclipse.ui.internal.editors.quickdiff.LastSaveReferenceProvider$ReadJob.run(LastSaveReferenceProvider.java:113)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)