Enhacements to the process of adding locked folders

[newadventure079]

Right now, adding multiple locked folders is not very convienient.

1. You cannot drag a folder onto the locked folder area, similar to how you can drag a folder to the file path area on the main window
2. If you press the folder icon to open the file browser and find the folders you want to add, you cannot hold down the Shift key to select and add multiple folders
3. After you add a locked folder and you press the folder icon to add another folder, the file browser window reverts you back to the default location (in my case ~/Movies) and not the folder you most recently added from.

[theophanemayaud]

There was another suggestion for one of these in #125 and I also agree it’s a great idea ! I’ll look at it asap 🤓 thanks a lot for the suggestions