EVIDENCE (live UI probe dump at 1280x720, build 2ebcc0164): after collapsing
the plugin shelf, PluginSidePanel rect=(1240,233,24,28) was correct, but
ShelfGripPanel rect=(1240,233,20,18) and the toggle rect=(1260,233,16,18)
stayed UNCHANGED from the expanded geometry. The toggle then sat outside the
24px shelf and the ancestor clip removed it, so the owner saw the tab with
no "<".
ROOT CAUSE: UiElement.ApplyAnchor (src/AcDream.App/UI/UiElement.cs ~829-856)
runs for every child on every draw (called at :699). For any child whose
Anchors != AnchorEdges.None, it captures the Left/Top/Width/Height margins
ONCE (_anchorCaptured) on the first draw and re-applies that snapshot every
subsequent draw, overwriting whatever PluginSidePanel.LayoutChrome/Reflow had
just set. The grip, the toggle, and each PluginShelfButton entry were
constructed with the default Anchors (Left|Top), so their first-draw
geometry froze. The shelf itself already used AnchorEdges.None for exactly
this reason. Unit tests never caught it because UiRoot.Tick does not draw —
the anchor snapshot only exists after a real Draw pass, and the prior
draw-level toggle tests only ever drew once, before any collapse.
FIX: set Anchors = AnchorEdges.None on _grip, _toggle (PluginSidePanel
constructor) and each PluginShelfButton entry (PluginSidePanel.Add) — the
shelf is the sole layout owner of these children and anchoring is the wrong
mechanism for them, not a per-reflow patch via ResetAnchorCapture().
PluginMinimizeButton is untouched (it is a child of the plugin window and
deliberately anchors Top|Right).
TESTS (tests/AcDream.App.Tests/UI/PluginSidePanelToggleGlyphClipTests.cs):
- Collapse_AfterADraw_RepositionsGripAndToggle_NotFrozenAtExpandedGeometry:
draws the shelf, collapses via a real UiRoot press/release, draws again,
and asserts the grip/toggle geometry actually reflects the collapsed
Width/Height rather than the frozen expanded snapshot. Failed-first
(pre-fix) at line 364 with "Expected: 8, Actual: 20" (grip.Width frozen at
the pre-collapse value instead of the new collapsed Width - ToggleWidth).
- MultiColumnReflow_AfterADraw_EveryRemainingButtonMatchesAFreshSinglePassLayout:
12 entries, draw, unregister one window (a real removal), draw again, and
compares every surviving button's geometry against an independent
reference shelf built directly with the same final 11-entry set. Failed-
first with "Expected: 16, Actual: 48" (a surviving button's Left frozen at
its stale 12-entry column/row instead of the fresh 11-entry reflow).
Both tests use font: null (bitmap fallback) so they run in every CI lane
without an installed retail DAT, unlike the Lane=InstalledDat tests above.
VERIFY: dotnet build (Release) green for src/AcDream.App and the test
project. Targeted filter (PluginSidePanel|Markup|UiRootInput): 130/130
passed. Full tests/AcDream.App.Tests suite: 7353 passed / 97 skipped / 36
failed - matching the stated baseline (7351/97/36) plus the two new tests;
the 36 failures are the pre-existing environment-gated set (installed-DAT
version mismatch, Linux-only waiter, Lane=Manual live-mount probes) and are
unrelated to this change.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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