14.15: a chosen layer is revealed in the Layers panel

src/Document/EditorSession.cpp

@@ -126,6 +126,9 @@ void EditorSession::selectLayer(std::optional<QUuid> id)
         resolveGradient();
     }
     setActiveLayerID(id);
+    // A layer chosen on the canvas shows in the panel.
+    if (revealActiveLayer())
+        notify();
 }
 
 void EditorSession::selectTool(NavigationTool value)

src/Document/LayerGroups+Session.h

@@ -6,6 +6,8 @@ public:
     // The primary layer becomes active when the document holds it.
     void selectLayers(const QSet<QUuid> &ids, std::optional<QUuid> primary);
     void extendSelection(QUuid id);
+    // Opens the active layer's folders; true when one opened.
+    bool revealActiveLayer();
     void groupSelectedLayers();
     // The active layer is a folder: something to unwrap.
     bool canUngroupLayers() const;

src/Document/LayerGroups.cpp

@@ -170,9 +170,26 @@ void EditorSession::selectLayers(const QSet<QUuid> &ids, std::optional<QUuid> pr
                                                                             : std::optional(*valid.begin());
     setActiveLayerID(active);
     m_selectedLayerIDs = valid;
+    revealActiveLayer();
     notify();
 }
 
+bool EditorSession::revealActiveLayer()
+{
+    if (m_collapsedGroupIDs.isEmpty() || !m_activeLayerID || !m_document)
+        return false;
+    // Validated parents end at the root: no cycle to guard.
+    const std::vector<ImageLayer> &layers = m_document->layers;
+    const int found = indexOf(layers, *m_activeLayerID);
+    std::optional<QUuid> parent = found >= 0 ? layers[found].parentID : std::nullopt;
+    bool opened = false;
+    while (parent) {
+        opened = m_collapsedGroupIDs.remove(*parent) || opened;
+        parent = layers[indexOf(layers, *parent)].parentID;
+    }
+    return opened;
+}
+
 void EditorSession::extendSelection(QUuid id)
 {
     const auto known = [&](const ImageLayer &layer) { return layer.id == id; };