Bug report

Bug summary

Currently, FigureManagerBase defines {get,set}_window_title, which is overridden by the various gui-specific subclasses; FigureCanvasBase also defines {get,set}_window_title, which just forwards to the manager's method, but is a no-op otherwise. This has the consequence that one can call these methods on a canvas when embedding without using pyplot (#17716), but they will silently do nothing in that case, which... let's say qualifies as not nice behavior.

One option would be to just deprecate and remove the wrapper methods on canvas, and tell the user that they need to go through the manager (only possible if using pyplot) or gui-specific methods. Another option would be to instead move the main implementations to the canvas classes themselves (regardless of whether you're using pyplot or embedding, the notion of parent window for a FigureCanvasQt, for example, always makes sense, and one can always manipulate its title), and also move the gui-subclass-specific overrides to FigureCanvasFoo, and make the method on the manager just forward to the canvas. This would "always work", as a manager always has a canvas, but feels a bit dirty because we "sort of" want canvases to be only related to drawing and let the manager handle the windowing part.

Matplotlib version

• Operating system:
• Matplotlib version:
• Matplotlib backend (print(matplotlib.get_backend())):
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• Jupyter version (if applicable):
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