feat: remap "add cursor above" to D instead of Alt-C

[NikitaRevenco]

There have been several discussions that people would prefer if the editor did not make any default Alt-* keymappings:

• Discussion
• Reddit Post
• Reddit Post
• Discussion

So this PR is going to help a little bit with that.

I remapped Alt-C (copy_selection_on_prev_line) to D because it adds a cursor above, and D is above the C key.

Alt-C requires 3 keystrokes (alt, shift, C) and is uncomfortable to type

To me, it makes sense that D and C will be together. The C which adds a cursor below, is lower. And D which adds a cursor above, is above C. I think there is logic to that.

D is also not mapped to anything at the moment.

This is just my opinion and if you have a better place to put this keymap then please let me know! I feel like the alt-* keymappings should be gradually removed

[kirawi]

Thanks for the PR.

To me, it makes sense that D and C will be together. The C which adds a cursor below, is lower. And D which adds a cursor above, is above C. I think there is logic to that.

This is only on QWERTY. We generally don't choose keybindings based on positions, and instead try to make them easy to remember. We are also fairly conservative about changing keymaps since this would be a huge breaking change for a lot of people's muscle memory. Actually, I think right now the maintainers don't have much interest in changing the keymaps in general since they can be rebound in people's configs.