Bug 114098 [content assist] Camel case completions are not inserted
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/LazyJavaCompletionProposal.java
public CharSequence getPrefixCompletionText(IDocument document, int completionOffset) {
		return getReplacementString();
	}
	/*
	 * @see ICompletionProposal#getImage()
	 */
	public final Image getImage() {
		if (!fImageComputed)
			setImage(computeImage());
		return fImage;
	}
	protected Image computeImage() {
		return JavaPlugin.getImageDescriptorRegistry().get(fInvocationContext.getLabelProvider().createImageDescriptor(fProposal));
	}
	/**
	 * Sets the image.
	 * @param image The image to set
	 */
	public final void setImage(Image image) {
		fImageComputed= true;
		fImage= image;
	}
	/*
	 * @see ICompletionProposalExtension#isValidFor(IDocument, int)
	 */
	public final boolean isValidFor(IDocument document, int offset) {
		return validate(document, offset, null);
	}
	/*
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#validate(org.eclipse.jface.text.IDocument, int, org.eclipse.jface.text.DocumentEvent)