smoothscroller: always emit scrollingStopped from scrollTo

When scrollTo() is asked to move to the position the scrollbar already
holds (clamped, e.g. an item at the bottom, or a sub-pixel offset), no
animation runs and scrollingStopped() was never emitted. Callers waiting
for it stayed blocked: KItemListView::scrollToItem() delegates to scrollTo
for any non-zero offset, and DolphinView::renameSelectedItems() only opens
the inline rename editor once scrollingStopped() arrives. So inline rename
silently did nothing for the affected items.

Emit scrollingStopped() in the no-op case too, and add a regression test.

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