Concurrently supporting both document-based and object-based undo operations

A method comprising:

• storing multiple sessions in an undo record in a last in first out manner, wherein the undo record is structured as a modified stack, wherein a modified stack allows an identified session to be percolated to the top and removed, each of the multiple sessions indicating an action performed on data of a document as well as one or more objects of the data on which the action was performed, each of the one or more objects comprising a user-selectable element of the data;
• performing an object-based undo operation by:
• identifying a topmost session of the undo record that includes a first selected object, wherein the object is selected from a single display of the document in which the object appears;
• percolating the identified session to the top of the undo record;
• and
• undoing the action in the identified session.

A computing device comprising:

• one or more computer-readable storage media embodying instructions which, when executed, implement modules comprising:
• an input module configured to receive user inputs to the computing device, the user inputs identifying actions performed on data of a document displayed by the computing device;
• an action logging module configured to store multiple sessions, in an undo record in a last in first out manner, wherein the undo record is structured as a modified stack, wherein a modified stack allows an identified session to be percolated to the top and removed, each session of the multiple sessions indicating an action performed as part of a user input as well as one or more objects of the data on which the action was performed, each of the one or more objects comprising a user-selectable element of the data;
• and
• an action undo module configured to:
• perform an object-based undo operation by identifying a topmost session of the undo record that includes a first selected object, wherein the object is selected from a single display of the document in which the object appears, percolating the identified session to the top of the undo record, and undoing the action in the identified session.