Search result categories forget expanded/collapsed state between searches

[ctrueden]

I often want to run Commands when searching. But by default the Commands category starts collapsed. Furthermore, after expanding it, then searching for something new, it becomes collapsed again. It would be better if each category in the search results tree remembered its expanded/collapsed state after being toggled. One way of doing it would be save the expanded/collapsed state via the PrefService. Another way would be to simply expand everything being searched by default, with the caveat that the SciJava search library supports toggling of each category to turn off that type of search.