dc73780f6 Roll Dart SDK from c7c4495b38ea to 3f811750bf8a (2 revisions) (flutter/engine#24979) (#78083)

Revert "f4c513eb8 Fix missing declaration of windows' default_package (flutter/plugins#3705) (#78025)" (#78065)

This reverts commit 63eefe7a.

Merging on red to fix the build.

[flutter_tools] read expression compilation results into memory before starting next compilation (#77867)

Landing this on red to fix the build.

TBR=@justinmc

Update samples to use repo analysis options, Fix sample templates and a ton of analyzer issues (#77868)

Text editing shortcuts involving the arrow keys are no longer handled by RenderEditable's RawKeyboardListener, they use the new Shortcuts setup.  First PR in a plan to port all text editing keyboard handling to shortcuts.

The TextInput.setMarkedRect message was originally added to support
positioning the IME candidates menu on iOS, but is now used by iOS,
Windows, macOS, and Linux desktop embedders.

Now that ShaderMask works on web, enable it for CupertinoContextMenu and unskip relevant tests.