DLE proposal: Optional background shading for indentation levels

I am currently learning Python using IDLE, and I would like to propose an optional visual aid that could make Python’s indentation structure easier to understand and debug. The feature would apply a subtle background shade to each indentation level. When code enters a nested block—such as an if, while, for, or function—the background shade would change. When the indentation moves back to the left, that shaded area would end. This could make it immediately clear which lines belong to each block...