Adding Undo Redo features for Flood Fill

[ninonur]

My draw app has an undo/redo function working properly before, now I am trying to add this ability for Flood Fill. My idea is to create an object class that holds each flood filler data then adding it into an array list. Can someone teach me which data of filler I could save instead of bitmap?

[ninonur]

Omg, I did it.....!!!

[darrinps]

Great. Please submit a PR so this can be added to the project.