Remove unused spark-selection example (it's not a UI element anyway)
Update spark-button example
Disable creating sub-branches from remoteBranches.
Rename assets -> resources to pacify `pub serve`
Fix/expand spark-button example
Merge remote-tracking branch 'upstream/master' into widget-examples-2
Missed one attr
Disable syncfs on non-chromeos.
add prelaunch participant for dart
Merge branch 'master' into work
fix nits
address comments
Fixed most widget examples; splitter and toolbar regressed/unfinished
changed paricipant to return bool
Allow overriding onSubmit event in dialogs.
Merge branch 'master' into disable_sync
Disable syncfs on all platforms.
fixed typo.
Merge branch 'master' into fix_git_branch
minor ui tweat as suggested in comments.