MappedSignal example crashes on pop. General MappedSignal weirdness about dioxus HOT 2 CLOSED

This is an issue with memos. The memo is being run after the child component should be dropped which causes the index out of bounds issue. The mapped signal example works in #2029

from dioxus.

1. the child components` memos only get re ran when the value of the index of the vector changes (new element is pushed, in this context)
2. the child components dont re render at all if the vector index they are mapped to does not change which they currently do, the printlns are the same if you put them outside the memos)
   changing the child component to this

The current behavior is intentional. MappedSignal just maps reads from a signal. It doesn't clone any data, or memorize values. This makes it possible to use MappedSignal with data that is not Clone or PartialEq. If you would like to memorize the result, you can use the use_memo hook. Because it doesn't memorize the result, MappedSignal has the same subscriptions as the orignal signal.

For Vecs, HashMaps, and HashSets, it would be nice to provide a more efficient Signal version with smarter element subscriptions.

from dioxus.