Version: 2017.3

Undo.CollapseUndoOperations

Switch to Manual
public static void CollapseUndoOperations (int groupIndex);

Description

Collapses all undo operation up to group index together into one step.

This is used by the color picked to combine all color modifications into a single step once the color picker is closed, while they are seperate operations when the color picker is still open.