Kemi: W1 loses its page and sort after every save #1468

What is wrong

Every reload after a save sets the inventory to null, which unmounts the W1 grid (*ngIf="inventory"). The paginator page and the sort are lost after registering, moving or removing a placement. This follows the I-1 rule "never show empty while loading", so the fix has to keep that rule.

Where (stable a81a41b)

• eform-client/src/app/plugins/modules/backend-configuration-pn/modules/chemicals/components/chemical-inventory-page/chemical-inventory-page.component.ts:126-130 (reload() calls setInventory(null))
• eform-client/src/app/plugins/modules/backend-configuration-pn/modules/chemicals/components/chemical-inventory-page/chemical-inventory-page.component.html:70

Suggested fix

On a reload after a save, keep the current inventory on screen (with a loading state) and replace it when the answer arrives. Clear it only on a property switch. Add a spec that page and sort survive a save.

Origin

Plan E final review §4 (T12 N-m2), PR #1437 (merged as a81a41b).

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