MohoDoc:PrepUndo(layer, shallow, willOnlyAddPoints)

Version added: before 9.5

Arguments:

Name	Type	Description	Default	Ver
layer	MohoLayer	The layer that is about to be modified		< 9.5
shallow	bool	Added in version 11	false	11.0
willOnlyAddPoints	bool	Added in version 14.0	false	14.0

Return value:

void none

Mark a point in editing that the user can "undo" to return to.
NOTE: The original Moho 5.6 documentation stated that passing nil as the argument marks a forthcoming operation as "not undoable". However, it looks like in modern versions, perhaps from version 11, passing nil works for the entire document, not a single layer.

See also: MohoDoc:PrepMultiUndo

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Usage of 'PrepUndo' is found in the following scripts:

Move selected to coord (Original Edition) by Stan View Code

Layer Copies (Original Edition) by Stan View Code

AE Mix Smartbones (Original Edition) by A.Evseeva View Code

AE Key Tools (Original Edition) by A.Evseeva View Code

Multilayer magnet (Original Edition) by A.Evseeva View Code

AE Trangulate Shapes (Original Edition) by A.Evseeva View Code

Replace PSD (Original Edition) by A.Evseeva View Code

Create joint helper (Original Edition) by A.Evseeva View Code

Create joint helper (works with multiple selected bones) by A.Evseeva View Code

Tweak for Curve Exposure (Original Edition) by A.Evseeva View Code

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