colgap and rowgap behave weirdly after creating an inset axis

[thudjx]

The MWE goes like:

let
	fig = Figure()
	ax1 = Axis(fig[1,1], xaxisposition=:top)
	ax2 = Axis(fig[2,1])
	inset_box = Axis(fig[1,1], width=Relative(0.4), height=Relative(0.2), halign=0.45, valign=0.25)
	rowgap!(fig.layout, 0)
	fig
end

The rowgap! is not working correctly:

However, if we change the line creating the inset_box into:

inset_box = Axis(fig[2,1], width=Relative(0.4), height=Relative(0.2), halign=0.45, valign=0.25)

everythings go back to normal:

The same issue comes with colgap and the MWE is here:

let
	fig = Figure()
	ax1 = Axis(fig[1,1])
	ax2 = Axis(fig[1,2], yaxisposition=:right)
	inset_box = Axis(fig[1,1], width=Relative(0.4), height=Relative(0.2), halign=0.45, valign=0.25)
	colgap!(fig.layout, 0)
	fig
end

The inset_box created this way works correctly but this does not:

inset_box = Axis(fig[1,2], width=Relative(0.4), height=Relative(0.2), halign=0.45, valign=0.25)

[jkrumbiegel]

This just looks like rowgap doesn't work, but the actual effect is that you reduce the width/height of the additional axis, but its lower protrusions still causes that space to be reserved. This is because it requests the maximum amount of space needed, not the one currently needed (as it depends on the overall space available and thus changes when the layout is recomputed). You can probably set inset.alignmode = Outside(0) so it doesn't have protrusions. In the future, there will probably be more convenient functions added to create inset axes that avoid this.