Bug 16181 Tab key doesn't work in editor when 'Insert spaces for tabs' enabled
Using integration build 0515, pressing Tab in an editor window doesn't do anything when 'Insert spaces for tabs' is selected. The editor is marked as unsaved, but no spaces appear.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
filePath= filePath.removeTrailingSeparator();
		final String fileName= filePath.lastSegment();
		IPath folderPath= filePath.removeLastSegments(1);
		if (folderPath == null) {
			if (progressMonitor != null)
				progressMonitor.setCanceled(true);			
			return;
		}
		
		IWorkspaceRoot root= ResourcesPlugin.getWorkspace().getRoot();
		
		/*
		 * 1GF7WG9: ITPJUI:ALL - EXCEPTION: "Save As..." always fails
		 */
		final IPackageFragment fragment= getPackage(root, folderPath);
		IFile file= root.getFile(filePath);
		
		/*
		 * Fix for http://dev.eclipse.org/bugs/show_bug.cgi?id=8873
		 * Problem caused by http://dev.eclipse.org/bugs/show_bug.cgi?id=9351
		 * Will be removed if #9351 is solved.
		 */
		if (original != null && original.equals(file) && original.exists()) {
			doSave(progressMonitor);
			return;
		}
		
		
		final FileEditorInput newInput= new FileEditorInput(file);
		final boolean originalExists= original.exists();