[xmonad] MultiToggle with WorkspaceCursors

[Brandon Allbery]

My guess is that MultiToggle doesn't and can't know about
WorkspaceCursors, and WorkspaceCursors doesn't and can't know that it
needs to duplicate the layout state for each group it introduces, so
any layout state change applies to all groups.

On Fri, Mar 24, 2023 at 11:22 AM ivan <ivan.brennan at gmail.com> wrote:
>
> Hi, I'm trying to get MultiToggle and WorkspaceCursors to play nicely with each other.
>
> Ordinarily, MultiToggle lets you apply a layout transformation to the current workspace without affecting the layouts of other workspaces. E.g. if I toggle workspace 1 to Full layout, it won't impact the layouts being used on workspaces 2, 3, etc.
>
> I've started using WorkspaceCursors (XMonad.Actions.WorkspaceCursors) to manage independent groups of workspaces, and noticed that if I use it's functions (e.g. modifyLayer) to navigate between workspaces, layout toggle states seem to bleed across workspaces rather than remaining independent per workspace.
>
> For example, starting on workspace 1 with my regular Tall layout, I navigate to workspace 2 and toggle it to Full layout. Then I go back to workspace 1 and see that it, too, has been toggled to Full layout.
>
> I can't figure out exactly what's causing this, or how to fix it so that workspace layouts toggle independently. I'm hoping someone here sees what I'm missing.
>
> I put together a minimal config to reproduce the problem:
> https://github.com/ivanbrennan/xmonad-testing/commit/2e9541b0937eee31ae7f300e130dc55a9c5933af#diff-61bfccbc988708bd118b33f9299c64aa8b3e532e25cc8eaa3b716f53215fb196
>
> The config provides two groups (A and B) of nine workspaces.
>
>     group A: 1A 2A 3A 4A 5A 6A 7A 8A 9A
>     group B: 1B 2B 3B 4B 5B 6B 7B 8B 9B
>
> Its layoutHook consists of:
>
>     myLayoutHook =
>       workspaceCursors cursors
>         . avoidStruts
>         . mkToggle1 FULL
>         $ Tall 1 (3/100) (1/2)
>
> Keys super+1 .. super+9 use WorkspaceCursors functions to switch between workspaces within the currently active group.
>
> Keys super+ctrl+1 .. super+ctrl+2 use WorkspaceCursors functions to switch between groups A and B.
>
> Additionally, keys super+meta+1 .. super+meta+9 use traditional StackSet functions to switch between workspaces 1A .. 9A. I added these for comparison, showing that MultiToggle state is recognized per-workspace when using this form of navigation.
>
> I can't figure out the root cause. I suspect the most relevant pieces of code from WorkspaceCursors and MultiToggle are the following:
>
> https://github.com/xmonad/xmonad-contrib/blob/e60805bd45ca2feb9ef3335d023daae5d02dbf4f/XMonad/Actions/WorkspaceCursors.hs#L204-L215
>
> https://github.com/xmonad/xmonad-contrib/blob/e60805bd45ca2feb9ef3335d023daae5d02dbf4f/XMonad/Layout/MultiToggle.hs#L193-L218
>
> Does anyone know what I might be missing, or how I could debug further to get to the root of the problem?
>
> Thanks!
> Ivan
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com