Address review: force target to All when the pane picker is hidden

When only one pane is live the Target row is hidden, but _aspectEditTarget
could remain a specific pane key — silently routing edits into a hidden
(and persistent arr:*) override in single-player. Reset the edit target to
"" in _aspectBuildTargets whenever the row is hidden (or the selected pane
is gone), so single-pane edits always go to the shared base.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: topkoa <topkoa@gmail.com>

plugins/highway_3d/screen.js

@@ -1837,7 +1837,13 @@
             o.value = pk; o.textContent = reg[pk].label;
             _aspectTargetSel.appendChild(o);
         });
-        if (_aspectEditTarget && !reg[_aspectEditTarget]) _aspectEditTarget = '';
+        // Force the edit target back to "All" when the Target row is hidden
+        // (single pane) or the selected pane is gone — otherwise a stale pane
+        // target would silently route edits into a hidden (and persistent
+        // arr:*) override in single-player.
+        if (keys.length <= 1 || (_aspectEditTarget && !reg[_aspectEditTarget])) {
+            _aspectEditTarget = '';
+        }
         _aspectTargetSel.value = _aspectEditTarget;
         // The Target row only matters with more than one pane (a split). With a
         // single pane there's nothing to disambiguate, so hide it.

tests/js/highway_3d_wide_fov.test.js

@@ -235,6 +235,14 @@ test('pruning drops the matching readout slot and a dangling __last', () => {
     );
 });
 
+test('single-pane forces the edit target back to All (no hidden pane edits)', () => {
+    assert.match(
+        src,
+        /if\s*\(\s*keys\.length\s*<=\s*1\s*\|\|\s*\(\s*_aspectEditTarget\s*&&\s*!reg\[_aspectEditTarget\]\s*\)\s*\)\s*\{\s*_aspectEditTarget\s*=\s*''/,
+        '_aspectBuildTargets must reset the edit target to "" when the Target row is hidden',
+    );
+});
+
 test('the panel has a dismiss (close) control', () => {
     assert.match(
         src,