refactor: use slotchange event instead of MutationObserver when possible
#14619
| Job | Run time |
|---|---|
| 1m 36s | |
| 1m 36s |
slotchange event instead of MutationObserver when possible
#14619
| Job | Run time |
|---|---|
| 1m 36s | |
| 1m 36s |