MultiViewError after resetting perspective

[danielwiehl]

Describe the bug

The workbench throws an error when resetting the perspective after moving a view from the peripheral area into the main area.

To Reproduce

Steps to reproduce the behavior:

1. Create a perspective with the following layout:

   provideWorkbench({
     layout: factory => factory
       .addPart(MAIN_AREA)
       .addPart('part.left', {align: 'left', relativeTo: MAIN_AREA})
       .addView('view', {partId: 'part.left'}),
   });

2. Drag the view into the main area
3. Reset perspective
4. See error

   root_effect_scheduler.mjs:3597 ERROR Error: [MultiViewError] Multiple views found: [id=view.5056046e]
      at _ɵWorkbenchLayout.views (ɵworkbench-layout.ts:510:83)
      at _ɵWorkbenchLayout.view (ɵworkbench-layout.ts:465:25)
      at matchesIfNavigated (workbench-route-guards.ts:202:25)

Environment

SCION Workbench version: 20.0.0-beta.7