(feat/keyboard) Tracks: Shift+Space sorts by current column / toggles sort order

[ronso0]

A convenient shortcut, especially when managin/rearranging playlists where you'd need to switch back'n'forth between sorted by # and sorted by artist/BPM/..

For context, currently we have

• Space for big library (default, can be changed via Custom.kbd.cfg)
• Ctrl+Space for toggling Played & BPM checkboxes (Qt default?)
• Ctrl+Return for Track Properties (hard-coded in c++)

First I tried Alt+Space but, like other Alt combos on my distro/WM, this is bound to window actions, here: 'Toggle Window Menu'.

[daschuer]

No objection, but how to inform the user about it?. It is doubtful that a user looks up the manual in the hope that it exists.

[daschuer]

Is interaction with the sorting COs desired?

[ronso0]

Well, for discoverability we currently rely on tooltips (Preview column: "Sort items randomly") and accelerator hints in the track menu / main menu (new crate, remove/hide, Track Info hotkey etc.).
Ctrl+click for library checkboxes is not documented afaik.
Neither is Alt+Up/Down/.. for moving tracks in playlists. (see recent requests / DnD complaints in the forums)

So, besides documenting it in the manual, what about a "Keyboard navigation" guide / popup?
This may be shown when keys are used in the tracks table for the first time. We
This is somewhat invasive, but with user's fingers already on the keyboard and 'Close' being focused by default it would be acceptable IMHO. Additionally we may add a '(i) Keyboard navigation' link to the Library preferences.

This is losely related to the discussions about feature discoverability we have every now & then (1st run wizard, guided tour, unresolved so far)

[ronso0]

Is interaction with the sorting COs desired?

This is connected to the header and thereby works exactly like when sorting by clicking a column title.
= hotkeys integrates nicely

[ronso0]

FWIW I got used to it and find it very helpful.

For discoverability I would even consider a popup:
when the tracks table receives a key press we show "Did you know you can use .. and .. to do this and that in the tracks view?"
(though we'd need to find a way to show that only on real keypresses, not emulated ones from controllers/LibraryControl)