Bug 33629 Double-quote as character value broken in RC1
There is a series of related bugs under the category of it's really hard to enter a character value containing a double-quote character and when you try it strange things can happen. 1. Single-quote balancing seems not to work at all. When you type a single quote you get a single quote. 2. When you type the character sequence '" the result is '"" (!) 3. When you try to backspace over the extra unwanted " (either the first or the second) both are erased. The only way to get the desired result seems to be to copy and paste the " character. 4. If you try to cut and paste in the ", you can get in some weird mode where the editor thinks a string exists where there is none. I'm still trying to figure out the sequence that produced the following lines: if (c == ''' || c == '"') {" + "} (Leading tabs removed for sake of example.) I only know that the last two " characters were not typed. No doubt another illustration why editor modes are a bad idea.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/correction/JavaCorrectionAssistant.java
* 
	 * @return an offset where corrections are available or -1 if none
	 */
	private int computeOffsetWithCorrection(int initalOffset) {
		if (fViewer == null || fViewer.getDocument() == null)
			return -1;
		
		IRegion lineInfo= null;
		try {
			lineInfo= fViewer.getDocument().getLineInformationOfOffset(initalOffset);
		} catch (BadLocationException ex) {
			return -1;
		}
		int startOffset= lineInfo.getOffset();
		int endOffset= startOffset + lineInfo.getLength();
		
		int result= computeOffsetWithCorrection(startOffset, endOffset, initalOffset);
		if (result > 0)
			return result;
		else
			return -1;
	}
	/**
	 * @return the best matching offset with corrections or -1 if nothing is found
	 */
	private int computeOffsetWithCorrection(int startOffset, int endOffset, int initialOffset) {
		IAnnotationModel model= JavaUI.getDocumentProvider().getAnnotationModel(fEditor.getEditorInput());
		int invocationOffset= -1;
		int offsetOfFirstProblem= Integer.MAX_VALUE;
		Iterator iter= new JavaAnnotationIterator(model, true);