Escape hotkey – single cancelActiveOperation command

The default Escape hotkey behavior has been consolidated. Previously the esc key was bound to two separate commands in the default hotkey bindings — cancelMeasurement and rejectPreview. Because the underlying hotkey library (Mousetrap) keeps only one handler per key, the later-registered binding (rejectPreview) silently shadowed the other, so cancelMeasurement never ran and an in-progress Spline/Livewire/PlanarFreehand contour (or any annotation being drawn) could not be cancelled with Escape.

Escape is now bound to a single generic command, cancelActiveOperation, which orchestrates the two single-purpose commands. Each is a no-op when its state is not active, so one Escape press consistently:

• rejects a provisional segmentation preview (via rejectPreview), and
• cancels an in-progress annotation being drawn (via cancelMeasurement).

Change

3.12 (old)	3.13 (new)
esc → cancelMeasurement and esc → rejectPreview (the latter shadowed the former)	esc → cancelActiveOperation
enter → acceptPreview	enter → acceptPreview (unchanged)

New command (cornerstone extension, CORNERSTONE context):

// extensions/cornerstone/src/commandsModule.ts
cancelActiveOperation: () => {
  actions.rejectPreview();     // discard a provisional segmentation preview
  actions.cancelMeasurement(); // cancel an in-progress annotation draw
},

Both rejectPreview and cancelMeasurement remain available as standalone commands; only their default esc hotkey bindings changed.

Migration

Most applications need no changes — the default behavior simply works as expected now.

If you provide a custom ohif.hotkeyBindings customization and want the same consolidated behavior, bind esc to the new command and remove the old duplicate esc entries:

Before (3.12):

'ohif.hotkeyBindings': [
  // ...
  { commandName: 'cancelMeasurement', label: 'Cancel Measurement', keys: ['esc'] },
  { commandName: 'acceptPreview', label: 'Accept Preview', keys: ['enter'] },
  { commandName: 'rejectPreview', label: 'Reject Preview', keys: ['esc'] },
];

After (3.13):

'ohif.hotkeyBindings': [
  // ...
  { commandName: 'cancelActiveOperation', label: 'Cancel', keys: ['esc'] },
  { commandName: 'acceptPreview', label: 'Accept Preview', keys: ['enter'] },
];

If you ran the cancelMeasurement or rejectPreview command directly (for example from a toolbar button or another command), no change is required — both commands still exist with the same behavior.

User key remaps: the per-user hotkey overrides stored in localStorage (user-preferred-keys) are keyed by command hash. A user who had personally remapped the old cancelMeasurement or rejectPreview key will fall back to the new esc default for cancelActiveOperation, since those old command hashes no longer exist in the defaults.

Reason

Binding two separate commands to the same key is inherently fragile — only the last registered binding survives. Routing Escape through a single orchestrating command removes the shadowing bug, keeps each underlying command single-purpose, and makes the "discard whatever is in progress" intent explicit.