CI found the gap the hard way: with every kind of asset in the project
the new scene sits below the panel, and the right click for "Set as
start scene" landed somewhere under the list instead of on the row.
locate() only asked whether a text was visible, and a masked row still
is - it is merely clipped away.
locateAll and overlayTexts now walk the tree together (eachText) and
carry the clip of every ancestor, measured on the widget that owns the
mask: Pixi v8 hands a Graphics set as a mask to the mask effect and
reports empty bounds for it, so asking the mask itself declares every
masked text in the editor missing. Two hooks with two notions of
"visible" was the second half of the same bug.
The panel also scrolls the selected row into view now, the way the
hierarchy has always done - an asset selected elsewhere has to be
findable in the list, test or no test. And step 21 learned that scene
is a property kind.
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