Allow transient opening of files
I often find myself in the situation of wanting to peek into files. This is useful for quickly getting a piece of information or to decide if a given file is the correct one to work on. Currently after peeking I find myself with a lot of opened files in the sidebar I didn't intent to keep and loose oversight. This forces me to think about cleaning up the mess and keeps my focus away from the problem at hand.
Other editors like VSCode or SublimeText help with this usecase by opening a file after selecting it, but keeping it in a transient state shown by the name in its tab being in italics. Double-clicking the file turns it into a permanent opened file, selecting another file will close the current transient one.