Bug 201906 [Viewers] 3.4 ColumnViewerEditor leaks ViewerCell instances.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewerEditor.java
viewer.getViewerRowFromItem(cell
												.getItem()), e);
							}
						}
					};
				}
				control.addTraverseListener(tabeditingListener);
				if (editorActivationListener != null
						&& !editorActivationListener.isEmpty()) {
					Object[] ls = editorActivationListener.getListeners();
					for (int i = 0; i < ls.length; i++) {
						((ColumnViewerEditorActivationListener) ls[i])
								.afterEditorActivated(activationEvent);
					}
				}
			}
		}
	}
	/**
	 * Applies the current value and deactivates the currently active cell
	 * editor.
	 */
	void applyEditorValue() {
		
		if (!inEditorDeactivation) {
			try {
				inEditorDeactivation = true;
				CellEditor c = this.cellEditor;
				if (c != null && this.cell != null) {
					ColumnViewerEditorDeactivationEvent tmp = new ColumnViewerEditorDeactivationEvent(