helix: primary cursor should be differentiated

[tylernku]

In helix, you can have multiple cursors operating on different selections in a file. You can cycle between them and remove selections. At any one time, one of the selections is considered to be primary and you can use keybindings to keep or dismiss it.

For example:

(Dracula_at_night)

(Ayu_dark)

Both these themes give the ability to differentiate between primary and secondary selections (with varying subtlety). They both rely on ui.cursor and ui.cursor.primary, and ui.selection and ui.selection.primary being visually distinct.

In stylix's helix config ui.cursor is defined and ui.cursor.primary is not. Also, ui.selection and ui.selection.primary are both defined as base02.

Here's what that looks like with the stylix config:

(Stylix)

[trueNAHO]

Thanks for this excellent bug report!

Currently, Stylix delegates Helix' theming to https://github.com/tinted-theming/base16-helix:

stylix/modules/helix/hm.nix

Lines 4 to 6 in a2d66f2

	theme = config.lib.stylix.colors {
	templateRepo = config.lib.stylix.templates.base16-helix;
	};

Consider patching the upstream theme and then submitting a Stylix PR to update the base16-helix input.