Good day

When '(Re)-generate automatic legend' is checked in the Figure Options dialog, the regenerated legend previously only preserved 'ncols' and 'draggable' settings. Other important legend properties like 'bbox_to_anchor', 'loc', 'mode', and 'borderaxespad' were discarded.

This fix captures these additional properties from the existing legend (if present) and passes them to axes.legend(), preserving the user's intended legend appearance.

Before (only ncols preserved):

new_legend = axes.legend(ncols=ncols)

After (all key properties preserved):

legend_kwargs = {
    'ncols': ncols,
    'bbox_to_anchor': bbox_to_anchor,
    'loc': loc,
    'mode': mode,
    'borderaxespad': borderaxespad,
}
new_legend = axes.legend(**legend_kwargs)

Testing:

• Verified that ncols, loc, mode, borderaxespad, and bbox_to_anchor are all correctly preserved when regenerating a legend with bbox_to_anchor=(0, 1.02, 1, 0.2), loc='lower left', mode='expand', borderaxespad=0, ncol=3
• Verified that the no-legend case (first legend creation) still works correctly
• Verified that legends without bbox_to_anchor or mode set still work correctly

Fixes #17775

Thank you for your attention. If there are any issues or suggestions, please leave a comment and I will address them promptly.

Warmly,
RoomWithOutRoof