Undo and Redo

Spark records every annotation edit in an undo stack. Mistakes are reversible.

Shortcuts

Also accessible via Edit menu, the toolbar Undo / Redo buttons, and the right-click document context menu.

What Gets Recorded

Every annotation-modifying action creates one undo entry:

Context Menu Ops

• Color change
• Opacity change
• Duplicate
• Delete (single or group)
• Bring to Front / Send to Back
• Flip Cloud Direction
• Insert Point Here
• Delete Point

Transform Handle Ops

• Move (one entry per drag, regardless of distance)
• Resize (one entry per drag)
• Rotate (one entry per drag)
• Vertex handle drag (one entry per vertex move)

Drawing Ops

• Creating an annotation (after finalising)
• Deleting via Delete key
• Cut / Paste

What Is NOT In the Undo Stack

• Page operations — insert / delete / rotate / reorder pages are tracked by a separate system (via Pages menu → Undo where applicable).
• View changes — zoom, scroll, switch tab do not push to the annotation undo stack.
• Save / Save As — not undoable; always make copies before destructive operations like Apply Redactions.
• Tool selection — switching from Rectangle to Circle tool is not recorded.

Stack Size

Up to 100 undo entries are kept. After 100, the oldest is discarded to keep memory bounded. If you need to revert further, close the document without saving.

Redo After Undo

If you Undo and then perform a NEW action, the Redo stack is cleared — you can no longer redo past the new action. This matches standard word-processor behaviour.

Across Documents

Undo stacks are per-document. Switching tabs doesn't mix undo histories. Closing a document discards its stack.

Status Bar Feedback

Each undo / redo shows the action description:

• Undo: Change color
• Redo: Move
• Undo: Flip cloud direction

Transactional Transforms

A single mouse-down-to-mouse-up drag is one undo entry, even if the cursor moved through hundreds of positions. Spark captures "before" state at mouse-down and "after" at mouse-up, skipping all intermediate frames.

When Undo Might Not Restore Perfectly

Practical Notes