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
Rectangle rightProposedBounds = new Rectangle(parentBounds.x
						+ parentBounds.width
						+ PopupDialog.POPUP_HORIZONTALSPACING, parentBounds.y
						+ PopupDialog.POPUP_VERTICALSPACING,
						parentBounds.width, parentBounds.height);
				rightProposedBounds = getConstrainedShellBounds(rightProposedBounds);
				
				if (rightProposedBounds.intersects(parentBounds)) {
					Rectangle leftProposedBounds = new Rectangle(parentBounds.x
							- parentBounds.width - POPUP_HORIZONTALSPACING - 1,
							parentBounds.y, parentBounds.width,
							parentBounds.height);
					leftProposedBounds = getConstrainedShellBounds(leftProposedBounds);
					
					
					if (leftProposedBounds.intersects(parentBounds)) {
						if (rightProposedBounds.x - parentBounds.x >= parentBounds.x
								- leftProposedBounds.x) {
							rightProposedBounds.x = parentBounds.x
									+ parentBounds.width
									+ PopupDialog.POPUP_HORIZONTALSPACING;
							proposedBounds = rightProposedBounds;
						} else {
							leftProposedBounds.width = parentBounds.x
									- POPUP_HORIZONTALSPACING
									- leftProposedBounds.x;
							proposedBounds = leftProposedBounds;
						}
					} else {