feat: Add layout configuration to exclude panes from tab sync

[on3iro]

Closes: #2285

This PR adds the ability to configure panes to be excluded from receiving input when tab sync is activated.
I'm not sure if there is a better way than to add another parameter to the write_to_pane_id-function - so just let me know if I should change something.

I also did not find any tests in regard to tab syncing, so I also didn't add any.

If this PR gets merged I should probably also make an addition to the zellij website providing an example in the layouts section. I am just a bit unsure right now, how these two repos are being kept in sync.
Should I already make the PR or should I wait until this PR might've been merged?

[imsnif]

Hey @on3iro - this is great work. Good job threading the attribute, I imagine it was not trivial to figure out!

I left some comments in the code, and also I think there's a bit of a functionality issue. Using this layout:

layout {
    pane
    pane split_direction="vertical" {
        pane
        pane exclude_from_sync=true
    }
}

If I start tab-sync, I can't write into the excluded pane even if I'm focused on it. Would you like to take a look?

[on3iro]

Hey @on3iro - this is great work. Good job threading the attribute, I imagine it was not trivial to figure out!

I left some comments in the code, and also I think there's a bit of a functionality issue. Using this layout:

layout {
    pane
    pane split_direction="vertical" {
        pane
        pane exclude_from_sync=true
    }
}

If I start tab-sync, I can't write into the excluded pane even if I'm focused on it. Would you like to take a look?

@imsnif thanks a lot for your kind words and feedback. I'll take a closer look at all the comments asap.
Regarding the functionality issue: I was aware of that behavior and it was a actually intentional on my side.
To me this behavior feels consistent, meaning that if I am inside sync mode, the pane should not receive input, no matter where I type. However I totally understand if you don't desire such behavior.
Should I try to make it so that the pane will always receive input when it is in focus? :)

[imsnif]

Should I try to make it so that the pane will always receive input when it is in focus? :)

Actually, this makes sense. Let's leave it like this.

[on3iro]

@imsnif I made the changes you requested. I kept them inside a separate commit for now, so they are easier to distinguish from the previous code. If you are satisfied with them you can just squash 'em :)

Just let me know if there is anything else I should change 👍

[imsnif]

Hey @on3iro - the code changes look good, thanks! If you'd like to merge from main again, we can give this one last spin to make sure all is working and then merge. I'll try to get to it quickly after you merge in order not to create more drift!

[on3iro]

Hey @imsnif - sorry for the late response. I am in the midst of moving into a new flat and super busy right now.
I will get back to this as soon as things have settled a bit. (probably around Thursday next week)

[on3iro]

@imsnif I squashed my two branches and rebased onto main - everything should be fine and ready to merge now :) 🎉

Should I also add a section to the docs repository?

[imsnif]

Very nice work on this! I hope the move went well. Thank you for your patience.