Grid size migration is a confusing experience for users because the
content of the grid is not predicatable to the user. Part of the reason
was the dedupe logic which merges items from new grid into old grid,
this mean if user removes an item, change to another grid and go back,
user will see that same item re-appears.
This CL keeps the content of target grid the same as source gird, i.e
user will will get the exact same set of app icons/shortcuts/folders and
widgets (if size permits) across grid sizes. The only difference being
their placement in the grid.
Bug: 256859723
Test: atest GridSizeMigrationUtilTest
Change-Id: I1732c91e441ad44bc43e0a943566a83563d12b07
The majority of the logic in grid size migration should be implemented
as static functions in the first place since (1) they only runs once
after instantiation and (2) they are executed immediately after they are
instantiated.
This CL removes most of the instance variables from grid size migration
in favor of static methods since the later is more efficient, more
testable and therefore considered better programming practice in
general.
Bug: 256859723
Test: atest GridSizeMigrationUtilTest
Change-Id: Ief4654d79ad5cfd636e6145fdcc9dfe5a39cdf62
Pinyao Ting