With a shape layer selected, the Rectangle, Rounded Rectangle, Ellipse,
Polygon and Star tools made a new shape layer for every shape. After
Effects draws into the selected shape layer instead: the shape becomes a
new group on top of its Contents ("Rectangle 2", ...), placed by the
group's Transform. The new shape.newShape command does that (in the
layer's space, so a moved or scaled layer still gets the shape where it
was drawn), and makes a new shape layer only when no unlocked shape
layer is selected. The viewer's shape tools use it; masks on other
selected layers are unchanged. layer.newShape and the Pen's
shape.newPath share its layer and Contents helpers.
Test: shape_tools_draw_into_the_selected_shape_layer,
shape_tool_draws_into_the_selected_shape_layer.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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