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This is a really small PR so I am skipping the issue (based on contributing.md). This change adds an optional field and thus non breaking for the API. I ran into an issue during my development of an alerts manager widget ([see PR](https://github.com/blackberryfloat/egui_widget_ext/pull/2)) where I needed a scrollable overlay that did not block clicking areas of a parent widget when my alerts did not take up the entire parent. To achieve this I detect the sizing pass via the invisible flag and only render the alerts content and then on the next pass I add the scroll bar in around the alert content. Whenever the alert content changed though I would need to create a new Area with a new id to get proper sizing. That is a memory leak so I wanted to reset the size state to trigger a sizing pass. Memory is rightfully protected enough that the path to remove memory was dropped and I just added a hook to set a resize flag. I am sure there are better ways but this is what made sense to me. Looking forward to thoughts. ~~Logistics wise, I have proposed it as a patch because I was based off 0.31.1 for testing. I was also thinking it could be released quickly. I am happy to cherry pick onto main after. If that is not allowed I can rebase to main and pull against that.~~ (rebased on main) --------- Co-authored-by: Wesley Murray <murraywj97@gmail.com>