Bug 127080 [Field Assist] widget disposed error on proposal insertion
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
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 {
						
						proposedBounds = leftProposedBounds;
					}
				} else {
					
					proposedBounds = rightProposedBounds;
				}
				getShell().setBounds(proposedBounds);
			}
			/*
			 * Set the text contents of the popup.
			 */
			void setContents(String newContents) {
				if (newContents == null)
					newContents = EMPTY;
				this.contents = newContents;
				if (text != null && !text.isDisposed()) {
					text.setText(contents);
				}
			}