feat(protocol-designer): allow user to change pipette selection

Instead of locking users into their initial pipette selection, we now allow users to select and
change their pipette while designing their protocol. In the best case, the change will happen
silently and will not effect the protocol at all. In the worst case, changing pipettes might require
users fixing invalidated parts of many affected steps and adding more tipracks to accomodate the
change.

Closes #2474, #2475, #2477

protocol-designer/src/components/modals/EditPipettesModal/index.js

@@ -13,10 +13,11 @@ import startCase from 'lodash/startCase'
 import isEmpty from 'lodash/isEmpty'
 import isEqual from 'lodash/isEqual'
 
-import type {PipetteData} from '../../step-generation'
+import type {PipetteData} from '../../../step-generation'
 import i18n from '../../../localization'
-import type {BaseState, ThunkDispatch} from '../../types'
+import type {BaseState, ThunkDispatch} from '../../../types'
 import {pipetteOptions} from '../../../pipettes/pipetteData'
+import type {PipetteFields} from '../../../load-file'
 import {
   thunks as pipetteThunks,
   selectors as pipetteSelectors,
@@ -27,7 +28,6 @@ import PipetteDiagram from '../NewFileModal/PipetteDiagram'
 import TiprackDiagram from '../NewFileModal/TiprackDiagram'
 import styles from './EditPipettesModal.css'
 import modalStyles from '../modal.css'
-import type {PipetteFields} from '../../load-file'
 import StepChangesWarningModal from './StepChangesWarningModal'
 
 type State = EditPipettesFields & {isWarningModalOpen: boolean}
@@ -64,8 +64,8 @@ const tiprackOptions = [
 const DEFAULT_SELECTION = {pipetteModel: '', tiprackModel: null}
 
 const pipetteDataToFormState = (pipetteData) => ({
-  pipetteModel: pipetteData ? pipetteData.model : '',
-  tiprackModel: (pipetteData && pipetteData.tiprack) ? pipetteData.tiprack.model : null,
+  pipetteModel: (pipetteData && pipetteData.model) ? pipetteData.model : '',
+  tiprackModel: (pipetteData && pipetteData.tiprackModel) ? pipetteData.tiprackModel : null,
 })
 
 class EditPipettesModal extends React.Component<Props, State> {