Bug 132798 [Field Assist] - Pressing Backspace at offset 0 should not reload field assist popup
N20060322-0010. After migrating the Find/Replace dialog to the new field assist support I found the following blooper: pressing the Backspace key at offset 0 reloads the field assist popup. Test Case: 1. in a text editor press Ctrl+F 2. enable regex search 3. in the Find filed press Ctrl+Space 4. continuously press Backspace ==> each time the proposal list is reloaded.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
* Caches the specified proposals and repopulates the table if it has
		 * been created.
		 */
		private void setProposals(IContentProposal[] newProposals) {
			if (newProposals == null || newProposals.length == 0) {
				newProposals = getEmptyProposalArray();
			}
			this.proposals = newProposals;
			
			if (isValid()) {
				final int newSize = newProposals.length;
				if (USE_VIRTUAL) {
					
					
					proposalTable.setItemCount(newSize);
					proposalTable.clearAll();
				} else {
					
					proposalTable.setRedraw(false);
					proposalTable.setItemCount(newSize);
					TableItem[] items = proposalTable.getItems();
					for (int i = 0; i < items.length; i++) {
						TableItem item = items[i];
						IContentProposal proposal = newProposals[i];
						item.setText(getString(proposal));
						item.setImage(getImage(proposal));
						item.setData(proposal);
					}
					proposalTable.setRedraw(true);
				}