[linux] Receives the unmodified characters obtained from GLFW (flutte…

…r#34752)

Hide text selection handle after entering text (flutter#37436)

The text caret wasn't being hidden after entering text, this fixes it.

use SizedBox instead of Container for building collapsed selection (f…

…lutter#37048)

Cherry-picks (flutter#36507)

flutter/engine#9935 Fix backspace crash on Chinese devices
flutter#36105 Catch a yaml parse failure during project creation

Use test instead of test_api package in platform_channel_swift exampl…

…e tests (flutter#35942)

Fixed logLevel filter bug so that filter now works as expected (flutt…

…er#35777)

Cherry-pick flutter/engine#9717

Update the help message on precache command for less confusion (flutt…

…er#35480)

Mark update-packages as non-experimental (flutter#35465)

Manual engine roll (flutter#35407)

```
45b66b7 Revert " Roll src/third_party/dart b37aa3b036...1eb113ba27 (flutter#9559)" (flutter#9584)
fc1d86b Revert "Avoid a full screen overlay within virtual displays (flutter#9343)" (flutter#9581)
140b2ae  Roll src/third_party/dart b37aa3b036...1eb113ba27 (flutter#9559)
94bb7a7 Adds API for retaining intermediate engine layers (flutter#9461)
7d1508d Roll fuchsia/sdk/core/mac-amd64 from cFEtOUFvy2XYSKuSmCMDaMQV8_Y7GOif521L3x86J_4C to n9fZpXVmsbgKZzS8Q2GXxB453q8AbLpfGztsPsq47pMC (flutter#9579)
7a0bbf9 Fixed memory leak by way of accidental retain on implicit self (flutter#9329)
```

v1.7.8 hotfixes (flutter#35423)

Cherry-pick the following PRs onto v1.7.8-hotfixes to prepare for release.

flutter/engine#9581
flutter/engine#9464
flutter#35221