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Miguel Angel Simon Sierra
fd5555be75
"Add keyframe at playhead" on an element with no id authored the bare class
buildStableSelector hands back, so one add on a `.group` wrote
`tl.to(".group", ...)`: a tween that animates all five siblings and that
resolveSelectorElementIds reads back as all five, collapsing their timeline
rows into one. It survived a reload, so the written file stayed un-editable.
writeTargetSelector is the write-side counterpart to selectorFromSelection
(which must keep returning the exact string findTweenAtTime compares against).
It resolves the element's own identity to a selector that addresses exactly
one element: `#id`, else `[data-hf-id="..."]`, else the selection's selector
when it is already unique, else a `:nth-child` path anchored on the nearest
identifiable ancestor (the selector + selectorIndex pair, resolved through the
DOM the index was counted in).
Applied to the two paths that author a NEW tween: the no-animation branch of
useEnableKeyframes and commitKeyframeAtTimeImpl. replace-with-keyframes still
writes the selection's own selector, since retargeting a tween the author
aimed at a whole group is a different decision from adding a keyframe.