feat: buffer groups

[akinsho]

With custom group separators and no highlights or icons

• Highlight buffers according to group

• Sort buffers according to group

• Group icons

• Group commands -

  • BufferLineGroupClose <completion>
  • lua API for acting on groups

• Group separator components

• Bugs

  • highlights for thin style active buffer broken
  • duplicated space on last group separator start

• Ensure feature is entirely opt-in

• documentation

• tests

[akinsho]

[ShiChenCong]

can i group file dynamic？when open file

[akinsho]

I'm not entirely sure I understand the request, but you have to define groups in advance you can't add them to a group if they don't match the group's definition

[ShiChenCong]

i mean, when open 3 buffer, i can groupa: buffer 1, buffer 2, groupb: buffer 3, not define on the config file

[akinsho]

@ShiChenCong, no, the feature is very new and there are still many things to consider adding, but currently buffers cannot be grouped dynamically by some command. I'm going to wait for things to stabilise and polish some rough edges before I think about adding any new grouping features.