constraining axes leads to paper coordinates being off and to extra space between plot area and annotations

[rl-utility-man]

If I constrain the x-axis, a legend to the right of the plot area shows up too far to the right and paper coordinates x=0 and x=1 are no longer at the edges of the plot area. Paper coordinate x=1 should always be the right edge of the plot area. There should not be excessive trapped white space between the legend and the plot area. The constrained, no-width behavior should be similar to the unconstrained and constrained-with-width behaviors.

Here I reproduce the problem using the documentation example here:
https://plotly.com/python/axes/#fixed-ratio-axes

I'm happy to provide and diff the output JSON if that would be helpful

import plotly.graph_objects as go
fig = go.Figure()
fig.add_trace(go.Scatter(
    x = [0,1,1,0,0,1,1,2,2,3,3,2,2,3],
    y = [0,0,1,1,3,3,2,2,3,3,1,1,0,0],
    name="demo"
))

##Add some elements outside the main plot area
fig.update_layout(
        title=dict(text="Source:  Plotly Bug Report",
                   yref="container",
                   xref="paper",
                   xanchor="right",
                  x=1, y=0.005),
                  showlegend=True
)


#the current layout is reasonable -- the legend is close to the plot area and x=1 in paper coordinates is where we expect it.
fig.show()

#now we constrain the domain and it injects lots of space between the plot area and the legend
#paper coordinates no longer reference the plot area -- paper coordinate x=1 is well to the right of the plot area
fig.update_xaxes(
    range=[-1,4],  # sets the range of xaxis
    constrain="domain",  # meanwhile compresses the xaxis by decreasing its "domain"
)
fig.update_yaxes(
    scaleanchor = "x",
    scaleratio = 1
)

fig.show()

#now we specify the width and the layout becomes reasonable again

fig.update_layout(
    width = 800,
)

fig.show()

unconstrained graphic (expected behavior):

constrained graphic (unexpected behavior)

constrained graphic with width (expected behavior)