Highlight match of pair left of the cursor in insert mode

[TheZoq2]

In the editors I'm used to (neovim, vscode), when in insert mode, the pair highlighting highlights the sibling of the pair to the left of the cursor when there is one, but helix seems to do the opposite.

This is probably easier to demonstrate with an example (| is the cursor)

((()|
  ^^

or

((())|
 ^  ^

Currently, helix seems to not highlight any of the parens in these situations. I find this very annoying, because I often use the pair highlighting to figure out if I need to add more parens. Here I have to guess or exit insert mode to check.

Of course, this becomes a bit ambiguous with matched parens, which neovim highlights like this,

((()|))
  ^^

but helix like

((()|))
 ^   ^

but for that to be intuitive, the highlighting needs to highlight both pairs (#8489)

[pascalkuthe]

The issue is that you viel the cursors as a bar instead of a Block. Helix used Block cursors semantica, where (even in insertmode) the cursors always has width one. So we don't highlight the brackets to the kwft of the cursors or to the right of the cursors but the bracket at the cursors.

It would be weird to apply the matching brackets highlight anywhere but the cursors itself. I don't think we will go forward with that