Re-think keyboard and mouse shortcuts

[philippotto]

A lot of the shortcuts grew historically and could be more intuitive. New UI elements, such as a context menu (see #4950), should be prioritized here, since they win the usability game.

However, we need to consider how to be compatible with existing power users. For example, a "legacy mode" could be offered.

Let's brainstorm first how the shortcuts could be designed from scratch and then think about how to get there.

[MichaelBuessemeyer]

While implementing #4950 I came up with the following idea:

By using golden layout we offer the user to adjust the tracing view to her/his likes.
I think we could do the same thing for the keyboard shortcuts. I had that idea because games today offer the user to change the keyboard mapping to make it more convenient/easier to use for the user. This would include:

• A "good" default for the keyboard shortcuts like we have one for the UI layout.
• A "legacy" default keyboard shortcut preset.
• Saving the saved keyboard shortcuts per user and maybe also adding the possibility to have multiple keyboard shortcut mappings in "keyboard profiles" that the user can switch through.
• Adding a keyboard mapping UI to the tracing. One easy to implement idea would be adding a new tab besides the info, mapping, etc. tabs. In that UI the user could see all shortcuts, therefore making the shortcuts more "discoverable" and he/she could adjust the shortcuts to his/her likes and also could switch between different keyboard mapping profiles and also reset the currently active profile to the default or legacy keyboard layout.

I do not know how hard it is to make the keyboard shortcuts mapping "dynamic". Maybe we could agree on hacking a spike to estimate whether this change effort / reward tradeoff is worth it 🤔

@philippotto @normanrz and other people with an opinion about this. What do you think about this idea?

Additional: Some shortcuts might be fixed: E.g.: Rightclick for the context menu or so.

[normanrz]

I think we should overhaul the keyboard shortcuts, because there it is quite messy with a lot of historical baggage atm. When doing that, we should offer "legacy" bindings for existing users. That part, I think we should have.
I don't think we should make the shortcuts entirely user-configurable, though.

[philippotto]

From our today's discussion, these would be the next todo items:

• refactor our internal shortcut handling so that an additional indirection can be used to offer a new and a legacy keybinding set (don't let users configure individual shortcuts, though)
• create a complete list of new shortcuts. here are already a few shortcuts (also see https://www.notion.so/scalableminds/Design-Doc-UI-and-Shortcuts-76a59ceaa7fb49d8810df24fd56f1282):
  • pressing space + moving mouse pans view (at least in orthogonal view)
  • old space-functionality is attached to "enter"
  • ctrl+scroll should zoom
  • support pinch-to-zoom
  • right-click always opens context menu
  • move should work by dragging the empty canvas if possible
• offer a UI to switch between legacy and new mode
• encourage user to switch to new mode (e.g., via a toast or modal?)