debug_ui: Improve debug rect bounds calculation & draw bounds on hover #16926
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Before this patch, it was possible that some objects did not have a debug rect despite existing on the stage and interacting with the user. That was the case for instance for buttons with hit bounds and no up state (see for instance #16921).
This patch ensures that debug rect is at least as big as highlight bounds, which are used to highlight focused objects on the stage.
Additionally, when the user hovers on world bounds and highlight bounds, debug rects signifying their positions are automatically drawn in order to visualize their positions on the stage.