Bug 52857 [spell checking] spell checking does not work for reused editors
3.0 M7 0. enable spell checking 1. set the editor preference to close editors automatically (allow only 1 editor) 2. open a CU with misspelled words in the Java editor ==> observe: spell check warnings appear 3. open another CU with misspelled words in the Java editor ==> observe: no spell check warnings
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/spelling/SpellReconcileStrategy.java
* 
		 * @param sentence
		 *                   <code>true</code> iff the word starts a new sentence,
		 *                   <code>false</code> otherwise.
		 */
		public final void setSentenceStart(final boolean sentence) {
			fSentence= sentence;
		}
		/*
		 * @see org.eclipse.jdt.core.compiler.IProblem#setSourceEnd(int)
		 */
		public final void setSourceEnd(final int end) {
			fEnd= end;
		}
		/*
		 * @see org.eclipse.jdt.core.compiler.IProblem#setSourceLineNumber(int)
		 */
		public final void setSourceLineNumber(final int line) {
			fLine= line;
		}
		/*
		 * @see org.eclipse.jdt.core.compiler.IProblem#setSourceStart(int)
		 */
		public final void setSourceStart(final int start) {
			fStart= start;
		}
	}
	
	private IDocument fDocument= null;