ResizePane() resizes first/the most left pane

[dustdfg]

Description of the problem or steps to reproduce

I want a sidebar (from the right side) so what I do:

1. Create buffer
2. Create split index from the buffer
3. Use ResizePane function on freshly created pane of sidebar

local sidebar_buf = buffer.NewBuffer("", "sidebar")

-- true here means to create it from right
sidebar =  bp:VSplitIndex(sidebar_buf, true)

sidebar:ResizePane(35)

What I expect:

Sidebar shrinks to size 35.

What I get:

The opened file that is on the left side shrinks to size 35

After getting something wrong I decided to try another thing. I decided to create sidebar on the left side and see what I will get. When I created the sidebar on the left side and tried to change it is size, I saw that this time it worked as expected. The sidebar shrink but I think it is only because it was on the left side and the function has a bug. It doesn't actually resize pane from which it was called. It just resizes the most left pane

Specifications

Commit hash: Version: 2.0.11 (it doesn't show commit hash)
OS: Debian 12
Terminal: foot

[JoeKar]

The problem is from my point of view within splits.go#L143 respective splits.go#L164, because they don't really respect if the last or a previous child will be resized and depending on this the action done c1 and c2 need to be exchanged.

[dustdfg]

Bug is also present in v2.0.13 68d88b5

[JoeKar]

Yep, I know...I reproduced it with the current master.
I think we've to add a bit more logic into the above two functions to get it running as expected. But even then, don't expect it to be merged quite soon, because the project owner currently hasn't the time to take care and we volunteers don't have the rights. ;)