Deleting legends fails

[bilderbuchi]

Having the same problem as reported here, i.e. wanting to update plotted lines including the legend, I ran into the issue that a delete!(legend) does not work.
With the code from that thread

using GLMakie
f = Figure()
ax1 = f[1,1] = Axis(f)
ax2 = f[1,2] = Axis(f)
p1 = lines!(ax1, rand(10), label = "foo")
p2 = lines!(ax2, rand(10), label = "bar")
function add_a_legend!(ax) axislegend(ax); return nothing end
add_a_legend!(ax1)
add_a_legend!(ax2)
empty!(ax1)
[delete!(leg) for leg in f.content if leg isa Legend]

I get

ERROR: MethodError: no method matching remove_from_gridlayout!(::Nothing)
Closest candidates are:
  remove_from_gridlayout!(::GridLayoutBase.GridContent) at C:\<snip>\.julia\packages\GridLayoutBase\lYdxT\src\gridlayout.jl:290
Stacktrace:
 [1] delete!(block::Legend)
   @ Makie C:\Users\<snip>\.julia\packages\Makie\gAmAB\src\makielayout\blocks.jl:508
 [2] (::var"#13#15")(leg::Legend)
   @ Main .\none:0
 [3] iterate
   @ .\generator.jl:47 [inlined]
 [4] grow_to!(dest::Vector{Any}, itr::Base.Generator{Base.Iterators.Filter{var"#14#16", Vector{Any}}, var"#13#15"})
   @ Base .\array.jl:860
 [5] collect(itr::Base.Generator{Base.Iterators.Filter{var"#14#16", Vector{Any}}, var"#13#15"})
   @ Base .\array.jl:784
 [6] top-level scope
   @ Untitled-1:11

from

Makie.jl/src/makielayout/blocks.jl

Line 508 in b1b9ef2

GridLayoutBase.remove_from_gridlayout!(GridLayoutBase.gridcontent(block))

This is with Makie 0.19.2, Julia 1.8.5.

Am I doing something wrong, or is this a bug?

[jkrumbiegel]

Probably just a bug, because deletion is currently untested. It would be a good project to start and make these methods more correct and robust, and fix that behavior via tests so that it doesn't break at the next moment again. This hasn't been the priority historically, because we had much more to do with creating things before we wanted to delete them :)

[bilderbuchi]

Thanks, I'll report it then.
edit: #2659