qtgui: remember Tile adjustments folding

src/qtgui/TilesPanel.cpp

@@ -35,7 +35,8 @@ void TilesPanel::setupUi() {
 
   m_currentGroupForm = nullptr;
 
-  addSeparator(tr("Tile adjustments"));
+  addSeparator(tr("Tile adjustments"),
+               QStringLiteral("tiles.adjustments"));
 
   m_exposureRow = addSliderParameter(
       tr("Exposure"), 0.01, 10.0, 100, 3, "", "",
@@ -92,6 +93,11 @@ void TilesPanel::setupUi() {
         return tileParameterKey(currentTileX(), currentTileY(),
                                 QStringLiteral("dark_point"));
       });
+
+  // The adjustment rows are added after the section header. Replay restored
+  // folding before the panel is first shown so a saved collapsed section
+  // cannot briefly expose the shared tile editors.
+  updateUI();
 }
 
 void TilesPanel::updateForNewImage() {

src/qtgui/main.cpp

@@ -1477,8 +1477,27 @@ bool runBetaInvariantSmoke() {
       findTileSpin(QStringLiteral("tiles.0.0.exposure"));
   QDoubleSpinBox *darkPoint =
       findTileSpin(QStringLiteral("tiles.0.0.dark_point"));
+  QToolButton *tileAdjustmentsToggle = nullptr;
+  QGroupBox *tileAdjustmentsGroup = nullptr;
+  for (QToolButton *button : tiles.findChildren<QToolButton *>()) {
+    if (button->property("sectionKey").toString() ==
+        QStringLiteral("tiles.adjustments")) {
+      if (tileAdjustmentsToggle)
+        return fail("duplicate Tile adjustments section key");
+      tileAdjustmentsToggle = button;
+    }
+  }
+  for (QGroupBox *group : tiles.findChildren<QGroupBox *>()) {
+    if (group->property("sectionKey").toString() ==
+        QStringLiteral("tiles.adjustments")) {
+      if (tileAdjustmentsGroup)
+        return fail("duplicate Tile adjustments group key");
+      tileAdjustmentsGroup = group;
+    }
+  }
   if (!tile0Selector || !tile1Selector || !tile0Enabled || !tile1Enabled ||
-      !exposure || !darkPoint ||
+      !exposure || !darkPoint || !tileAdjustmentsToggle ||
+      !tileAdjustmentsGroup ||
       tile0Enabled->property("parameterKey").toString() !=
           QStringLiteral("tiles.0.0.enabled") ||
       tile1Enabled->property("parameterKey").toString() !=
@@ -1487,6 +1506,25 @@ bool runBetaInvariantSmoke() {
       tile1Selector->property("parameterKey").isValid())
     return fail("tile keys crossed the document/selection-state boundary");
 
+  // Folding is presentation-only and must own the shared tile editors without
+  // touching the independent tile-selector grid or document state.
+  const bool originalTileAdjustmentsExpanded =
+      tileAdjustmentsToggle->isChecked();
+  tileAdjustmentsToggle->setChecked(true);
+  tiles.updateUI();
+  if (!exposure->isVisibleTo(tileAdjustmentsGroup) ||
+      !darkPoint->isVisibleTo(tileAdjustmentsGroup) ||
+      tile0Selector->isHidden())
+    return fail("expanded Tile adjustments did not expose its editors");
+  tileAdjustmentsToggle->setChecked(false);
+  tiles.updateUI();
+  if (exposure->isVisibleTo(tileAdjustmentsGroup) ||
+      darkPoint->isVisibleTo(tileAdjustmentsGroup) ||
+      tile0Selector->isHidden())
+    return fail("collapsed Tile adjustments did not own only its editors");
+  tileAdjustmentsToggle->setChecked(originalTileAdjustmentsExpanded);
+  tiles.updateUI();
+
   const double tile0Before = exposure->value();
   const colorscreen::luminosity_t tile0After =
       static_cast<colorscreen::luminosity_t>(