SliverList perform layout start from the initial child when there is no valid layout offset (#66262)

Remove fake image implementations, add createTestImage to flutter_test

This reverts commit 5c858036.

This reverts commit 53fee1be.

This reverts commit 5c858036.

The k toggle allows switching between canvaskit and html backend at runtime. unfortunately this causes hot restart to break, since the dart_sdk modules stores state at runtime. The recommendation will be to use cavaskit via dart-defines.

Fixes a bug when TextField is wrapped in IntrinsicHeight and visual density is below standard.

[versions] update to latest source span and roll engine to  4b8477d11573d233e6791204191c0090f733b05d (#66136)

Revert "Ensure VmService instance is disposed after failed direct connection attempt (#66123)" (#66164)

This reverts commit 409e994c.
Co-authored-by: Jenn Magder <magder@google.com>

_attemptServiceConnection in FallbackDiscovery would fail if the root
library URI was not a package URI even if the VM service connection
attempt was successful. This resulted in a VM service connection being
left alive, causing DDS to fail its connection to the VM service.

Updated _attemptServiceConnection to ensure the VM service instance is
disposed after a non-connection related failure and to allow for root
library URIs with a file scheme.