LogBrowser: double clicking on a checkbox displays the item but leaves checkbox unchecked

Below is a screen shot showing how an item can be displayed on the graph at the same time that the checkbox on the right is unchecked.

This happens if the user **double** clicks on the checkbox.


Start by locating the LogBrowser checkbox and double-click handling, then reproduce the issue by double-clicking a checkbox. Done means the displayed graph item and checkbox state remain consistent after the interaction.

Written by the indexing model from the issue text.