Ben Konyi 6dbbfe671f
[ Widget Preview ] Add support for "soft" restart of individual previews (#166846)
A soft restart simply removes the previewed widget from the widget tree
for a frame before re-inserting it on the next frame. This has the
effect of re-running local initializers in `State` objects, which would
normally require a hot restart to accomplish. This reduces the number of
cases where a full hot restart of the preview environment would be
needed to pick up state-related changes.

Fixes https://github.com/flutter/flutter/issues/166450

**Updated Controls:**


![image](https://github.com/user-attachments/assets/616f8fc4-0b57-4a1c-85e7-ef36126cdffe)

**Demo:** updates a string initialized in `initState`, triggering a hot
reload. The updated string isn't rendered until the restart button is
pressed, causing the widget to be reloaded with the new state
initialized.


https://github.com/user-attachments/assets/ab4abf8a-7823-491a-ad90-f83d877600ec
2025-04-10 16:20:11 +00:00
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