calendar@cinnamon.org: add keyboard navigation

[igorsantos07]

Is your feature request related to a problem? Please describe.

Once you open the calendar via the global shortcut, you can only see it :)

Describe the solution you'd like

Would be wonderful if it was possible to navigate it with the keyboard as well. Change to other days via arrow keys, then tab to the left panel, up/down to navigate between appointments, and enter to open one of them.

Describe alternatives you've considered

The keyboard shortcut still requires a mouse to interact with the applet, so it's 50% useless.

Additional context

• Cinnamon version 5.6.5
• Distribution Mint 21.1

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Originally mentioned on a fork applet, calendar by ccprog at linuxmint/cinnamon-spices-applets#4760

Also, when you open the calendar with Super+C, let go of the keys and want to close it again with Super+C, that doesn't work. The menu opens shortly and the calendar is there again. To get the expected behavior, you must not let go of the Super key after opening the calendar which I find unintuitive.

[github-actions]

This issue has been automatically marked as stale because it has not had
any activity in over 2 years.

If this issue is still relevant:

• Please test on a current version of this package.
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[igorsantos07]

I can't confirm the last comment about the calendar reopening when you press Super+C consecutively. It works as expected on my Linux Mint 22.2, both when I hold Super and when I let it go and press again.

[ataylor32]

I, too, would like to see this feature implemented. Just to add a short explanation for why this is useful (besides improving accessibility), it's nice to be able to click on a date and easily see what the date will be in, say, six weeks from that date by pushing the down arrow six times. You can do this in Windows and having this feature present in Linux Mint would help ease the transition from Windows.