What is Undo Marker?
Undo Marker is a macro that adds an entry to the Undo list. The entry includes the time at which it was created.
This can be used to "mark your spot" with something that is easier to find visually when looking at the drop-down Undo list, the drop-down Redo list, or the Undo Manager docker (renamed "History" in CorelDRAW 2019). Such a marker can make it easier to undo or redo something that might feel like one operation, but results in multiple entries in the list (e.g., experimenting with a color for a shape, where every "try" shows up as an entry on the list).
See Undo Marker in use:
Using the macro.
The macro is a simple sub. It can be run directly from the Macro Manager (Scripts docker in CorelDRAW 2019). Such a sub can be used as a Command in regular CorelDRAW workspace customization, so it can be used on toolbars or menus, and can have keyboard shortcuts assigned to it.
Sub in the Macro Manager.
OK, where's the macro?
JQ_Undo_Marker.zip (most recently updated 2019-12-05).
That includes the .GMS file and a simple icon that can be used on a CorelDRAW Toolbar.
Cool.Should be a built in feature.