Scroll center item into position
Merge branch 'umop-outline-remember_position' into umop-outline-sync_scroll
Merge branch 'master' of https://github.com/dart-lang/spark into umop-outline-sync_scroll
Fixed scrolling to include as many rows as possible
left and right border experiment.
reverting experiment
Merge branch 'master' of https://github.com/dart-lang/spark into umop-outline-sync_scroll
Fixed NPE and timing issue
Merge branch 'master' of https://github.com/dart-lang/spark into umop-outline-sync_scroll
Fixed to use the top of the next-after-last element rather than the bottom of the last element (so classes don't cause scroll to jump).
Merge branch 'master' of https://github.com/dart-lang/spark into umop-outline-sync_scroll
Merge branch 'umop-outline-sync_scroll' of https://github.com/dart-lang/spark into umop-outline-sync_scroll
Backdrop on Import File and Import Folder.  Import Folder's does not stick
Fixed return on importFolder and cleaned up code.
Resolved conflicts
Merge branch 'master' of https://github.com/dart-lang/spark into umop-outline-sync_scroll
Review fix
Spelling mistake
Externally supply the button for spark-menu-button

...for improved flexibility. Will be used for an easy fix of the currently imperfect menu icon.
Improve and clean up widgets' docs