ViewCube "already there → flip to opposite" tested the main (paper) camera,
which always looks straight down, so inside a floating viewport clicking
"top" landed on "bottom". Route the check through active_gaze_dir() — the
gaze of the camera the cube actually reflects.
Off-screen viewports:
- The active-viewport outline clamped only its origin while keeping full
width/height, shifting the whole border inward. Clip it to the visible
canvas (origin AND size) so it hugs the real viewport edge.
- Double-click activation tested each viewport's full paper rect, so a
click on empty space beside a viewport that runs off-screen matched its
partly-off-canvas rect and switched to it. Activation now keys on the
visible on-screen rect (viewport_at_screen_point), picks the smallest
(topmost) on overlap, and accepts the border-wire pick only when the
click also lands inside that viewport's visible rect — so a far
viewport's edge passing near the cursor can't steal the activation.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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