[Merged by Bors] - Fix query.to_readonly().get_component_mut() soundness bug #6401
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# Objective Fix the soundness issue outlined in #5866. In short the problem is that `query.to_readonly().get_component_mut::<T>()` can provide unsound mutable access to the component. This PR is an alternative to just removing the offending api. Given that `to_readonly` is a useful tool, I think this approach is a preferable short term solution. Long term I think theres a better solution out there, but we can find that on its own time. ## Solution Add what amounts to a "dirty flag" that marks Queries that have been converted to their read-only variant via `to_readonly` as dirty. When this flag is set to true, `get_component_mut` will fail with an error, preventing the unsound access.
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…#6401) # Objective Fix the soundness issue outlined in bevyengine#5866. In short the problem is that `query.to_readonly().get_component_mut::<T>()` can provide unsound mutable access to the component. This PR is an alternative to just removing the offending api. Given that `to_readonly` is a useful tool, I think this approach is a preferable short term solution. Long term I think theres a better solution out there, but we can find that on its own time. ## Solution Add what amounts to a "dirty flag" that marks Queries that have been converted to their read-only variant via `to_readonly` as dirty. When this flag is set to true, `get_component_mut` will fail with an error, preventing the unsound access.
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Objective
Fix the soundness issue outlined in #5866. In short the problem is that
query.to_readonly().get_component_mut::<T>()can provide unsound mutable access to the component. This PR is an alternative to just removing the offending api. Given thatto_readonlyis a useful tool, I think this approach is a preferable short term solution. Long term I think theres a better solution out there, but we can find that on its own time.Solution
Add what amounts to a "dirty flag" that marks Queries that have been converted to their read-only variant via
to_readonlyas dirty. When this flag is set to true,get_component_mutwill fail with an error, preventing the unsound access.