Added 4 finger Vertical gesture for app navigation

[adhadse]

The current state of using 3 fingers for both WIndow Switching and app navigation can be harder to get familiarized or even miss. Mapping these gestures to 4 finger in Vertical direction make things a lot easier and they are also not used (Edit: oh well they are used for WIndow Manipulation, but might be less frequently used in comparison to app navigation).

When default overview navigation gesture using 3-finger is on:

• 4 finger downward motion do forward navigation.
• 4 finger upward motion do backward navigation.

When default overview navigation gesture using 3 fingers is TURNED OFF using extension, i.e., overview gesture uses 4 finger instead (and window manipulation is on).

• 3 finger left motion do forward navigation.
• 3 finger right motion do backward navigation.

I have tested them and they work pretty fine.

And Heartful Thanks for this extensione🤩. Any plan to bake this into GNOME?

[harshadgavali]

@adhadse It would be better to add option to replace window manipulation gesture with forward/back gesture regardless whether overview gesture are 3 or 4 fingers.

Though I'm still not convinced that would be better cause forward/back is horizontal action not vertical one.

[adhadse]

@harshadgavali I think we are trying to put a lot of features which GNOME ecosystem tries to stay away from.

It would be whole lot better if we offer user what gesture he/she want to use for what. Like WIndows do (We can learn from them...) giving dropdown options to choose from and as a extension developer we need to only care about these gestures don't conflict with each other.

So, the user can decide if he/she wants navigation to be horizontal/vertial and 4/3 finger to suit their priority and needs, and then we give them option for possible gestures they are left with.

Thoughts?

[harshadgavali]

I think you misunderstood what I meant. While I still think assigning horizontal actions to vertical gesture is not natural, I'm still willing to add them.

What I meant is in this PR

• We should add option(dropdown option) to replace window navigation with app gestures (regardless of user's preference for 3/4 finger overview gestures).
• And also change app gesture animation to vertical if app gesture are replacing window navigation (and horizontal animation if we prefer current settings).