Refactor tonemapping example's image viewer update into two systems #11519
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…evyengine#11519) # Objective Alternative to bevyengine#11515. Fixes change detection being triggered on the "image viewer image material" every frame. ## Solution - Split the megasystem into two separate systems: one to handle drop events, and one to handle asset change events. - Move the event reader iteration "outside." so that we're only doing stuff when there are events. - Flatten some of the more extreme nesting - Other bits of cleanup, removing an unnecessary clone and unused variable. I think these systems can even run in parallel now, not that it particularly matters.
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Objective
Alternative to #11515.
Fixes change detection being triggered on the "image viewer image material" every frame.
Solution
I think these systems can even run in parallel now, not that it particularly matters.