fix: toggle panel once after Alt+D docker hide — derive visibility from IsWindowVisible, not stale g_panel.open flag

src/bank_panel.cpp

@@ -2850,15 +2850,29 @@ void bankPanelInit(ReaSamplerSession* session) {
     g_panel.session = session;
 }
 
+// Returns true only when the panel window is actually visible to the user right now.
+// IsWindowVisible() returns false when the docker is hidden via Alt+D even though the
+// HWND and g_panel.open are still live — the live query is the source of truth for
+// toggle decisions and the Actions-list checkmark (OnToggleAction in main.cpp).
+static bool panelEffectivelyVisible() {
+    return g_panel.hwnd && IsWindowVisible(g_panel.hwnd);
+}
+
 void bankPanelToggle() {
-    if (g_panel.open)
+    // Decide from live visibility, not the cached g_panel.open flag.
+    // Alt+D hides the docker without destroying the window, leaving g_panel.open
+    // stale (true) while the panel is gone. Using IsWindowVisible avoids the
+    // double-fire needed to re-show the panel after a docker hide.
+    if (panelEffectivelyVisible())
         closePanel();
     else
         openPanel();
 }
 
 bool bankPanelIsOpen() {
-    return g_panel.open;
+    // Derive from live window state so the Actions-list checkmark stays honest
+    // even after Alt+D hides the docker without notifying the extension.
+    return panelEffectivelyVisible();
 }
 
 std::vector<std::string> bankPanelSelectedSampleIds() {