MemoizeFunction does not store input values requested by draw methods

[josephmure]

What happened?

When the draw method of a MemoizeFunction is called, I would expect the grid points on which the function was called in order to produce the graph to be stored, but they are not.

How to reproduce the issue?

import openturns as ot
fun = ot.SymbolicFunction("x", "sin(x)")
mem = ot.MemoizeFunction(fun)
mem.draw(0.0, 10.0, 100)
print(mem.getInputHistory().getSize()) # prints 0

Version

master

Operating System

Linux

Installation media

from source

Additional Context

No response

[josephmure]

Tagging @vchabri who discovered the issue.