feat(commands): add clear_registers command

[chorcheus]

Hi,
there has been a feature request for an option to delete registers, so I politely created this. Thank you for your review.

Closes #4256

[the-mikedavis]

Instead of this being a new command, I think this should be implemented as a special key in the on_next_key callback of select_register. So you would clear registers by pressing " and then the key to clear all registers. I'm not sure what the keybind should be though

[geometryolife]

Instead of this being a new command, I think this should be implemented as a special key in the on_next_key callback of select_register. So you would clear registers by pressing " and then the key to clear all registers. I'm not sure what the keybind should be though

Perhaps using ”| is a good choice.

[chorcheus]

Instead of this being a new command, I think this should be implemented as a special key in the on_next_key callback of select_register. So you would clear registers by pressing " and then the key to clear all registers. I'm not sure what the keybind should be though

Perhaps using ”| is a good choice.

This could get tricky on different keyboard layouts - for example mine has it on opposite sides of keyboard. It could work if this key mapping was overridable - but for that one still needs a separate command to be called.

[chorcheus]

Instead of this being a new command, I think this should be implemented as a special key in the on_next_key callback of select_register. So you would clear registers by pressing " and then the key to clear all registers. I'm not sure what the keybind should be though

Perhaps using ”| is a good choice.

This could get tricky on different keyboard layouts - for example mine has it on opposite sides of keyboard. It could work if this key mapping was overridable - but for that one still needs a separate command to be called.

Another possible approach would be to create Registers mode in which one could select register or clear them. For convenience the select register command still could be called outside this mode too as it is now.

Simply binding one key to command after key select_register is pressed does not seem right since register keys should be pressed in that moment.

[chorcheus]

@the-mikedavis @geometryolife Thank you for all suggestions, I implemented a solution. I'd be thankful for the review since I am still not sure about the keymapping.

[chorcheus]

The work has been moved to #5695; this PR's source branch is master, which isn't convenient.