Remove assert from Image._handleImageFrame() (flutter#33602)

Tickers being disabled and re-enabled can cause the
condition of a synchronous notification happening after
image frames have been delivered, which is valid in that
case. As such, this removes the assert.

flutter#32374

Wrap Windows build invocation in a batch script (flutter#33443)

Invoking msbuild with runInShell makes handling path escaping more
error-prone, and substantially increases the chances of running into
maximum path limits. This replaces the direct call with a .bat wrapper
that calls vsvars64.bat then msbuild, and uses relative paths within the
script to keep command lengths short.

Fixes flutter#32792

Fix first focus determination. (flutter#33279)

Replacing the algorithm for finding the first focusable item in the focus tree. Somehow it was a kind of gibberish before, and really didn't work or make sense.

Add macosPrefix to the pubspec schema for plugins (flutter#33287)

Adds a new macosPrefix, which serves the same purpose as iosPrefix but
for macOS plugins.

It is not yet used by the tooling, but this allows for plugins to start
to be written using it in preparation for tooling support for plugins.

Part of flutter#32718

Slight clarification in the ImageCache docs (flutter#33195)

It was easy to miss the reference to the top-level `imageCache`
property before.  This calls out the property a little more
explicitly.

303a391 fix dartdevc build (flutter/engine#9036) (flutter#33155)

flutter/engine@75963db...303a391

git log 75963db..303a391 --no-merges --oneline
303a391 fix dartdevc build (flutter/engine#9036)

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Update enabled color for outlined text fields. (flutter#33083)

Resets the enabled color for outline text field default borders to "On Surface 38%" instead of "On Surface 12%" to match spec. Also fixes the hover overlay to be "On Surface 12%" to match spec.

Fix needsCompositing propagation from child widgets. (flutter#32717)

This fixes propagation of needsCompositing from child widgets.

When needsCompositing is turned on by a child widget, it necessarily sets the needsCompositing bit of its parent widget, but RenderPointerListener was ignoring that piece of information and only turning on compositing if it thought it needed it for itself.

This corrects that, and adds a test for the condition, and updates a test that was affected by the change.

Fixes flutter#32525 (again)

cherry-pick: fix edge swiping and dropping back at starting point (fl…

…utter#31623)

iOS selection handles are invisible (flutter#31332) (flutter#31862)

Fix a bug where text selection handles were invisible in iOS