BROWSER - Single Click Folder Open and Close

In the browser to open a folder you have to either select the expand arrow or double click on the folder.
Would there be any down sides to being able to open a folder with a single click of the folders name and close it by clicking the folders name again?

Start by locating the LMMS browser component and the code handling folder selection, expansion, and collapsing. Check how the current arrow and double-click actions are wired, then verify that a single click on a folder name opens it and clicking the name again closes it without breaking selection or navigation.

Written by the indexing model from the issue text.