Bug 125012 [Field Assist] Clarify lifecycle of the ILabelProvider used by ContentProposalAdapter
I20060119-0800 Clients who want to port their field content assistants from jface.text.contentassist to jface.fieldassist would expect to be able to supply an image in IContentProposal, e.g. with a 'Image getImage();' method as in ICompletionProposal. Without icons, e.g. proposals for java type names would look quite different from the ones you get in the java editor. There's also a lot more functionality in ICompletionProposal and the 4 ICompletionProposalExtension* interfaces. Some of those concepts must also be supported in fieldassist if clients such as the Find/Replace dialog and Java type completions in dialogs should switch (e.g. the additionalProposalInfo to show documentation for regex proposals, etc.). I can file separate bugs for these functionalities if you want to discuss them one by one.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
* The adapter used to extract the String contents from an arbitrary
	 * control.
	 */
	private IControlContentAdapter controlContentAdapter;
	/*
	 * The popup used to show proposals.
	 */
	private ContentProposalPopup popup;
	/*
	 * The keystroke that signifies content proposals should be shown.
	 */
	private KeyStroke triggerKeyStroke;
	/*
	 * The String containing characters that auto-activate the popup.
	 */
	private String autoActivateString;
	/*
	 * A flag indicating how an accepted proposal should affect the control. One
	 * of PROPOSAL_IGNORE, PROPOSAL_INSERT, or PROPOSAL_REPLACE.
	 */
	private int acceptance;
	/*
	 * A boolean that indicates whether keys events received while the proposal
	 * popup is open should also be propagated to the control.
	 */
	private boolean propagateKeys;
	/*
	 * A boolean that indicates whether proposals should be filtered as keys are
	 * typed when the popup is open.
	 */