preserve window proportions does not apply to vertical splits

[DylanMartin0930]

Description

when setting preserve_window_proportions to true, it preserves the sizing of horizontal splits only

Neovim version

NVIM v0.10.0-dev-1368+gbc66b755f-Homebrew
Build type: Release
LuaJIT 2.1.0-beta3

Operating system and version

Macos Ventura 13.3

nvim-tree version

fb65be0

Minimal config

require("nvim-tree").setup({
view = {
preserve_window_proportions = true,
},
}

Steps to reproduce

1. create vertical split
2. resize it in any direction
3. open and close file tree

Expected behavior

expect vertical split to stay the same size after toggling file tree on and off

Actual behavior

toggling file tree on and off causes vertical splits to be resized to be 50/50

[alex-courtis]

    *nvim-tree.view.preserve_window_proportions*
    Preserves window proportions when opening a file.
    If `false`, the height and width of windows other than nvim-tree will be equalized.
      Type: `boolean`, Default: `false`

The documentation notes that this applies when opening files (from the tree).

[alex-courtis]

A little debugging indicates that resizing is not done when opening the tree when preserve_window_proportions not set.

It's vim that's doing the resizing, not nvim-tree. You can demonstrate this by opening another vertical split inside a narrow window.

Take a look at :help wiw and :h wmw to adjust this behaviour.