IDEA-152049 Favorites collapses in unpinned mode after some time and changes in editor

platform/lang-impl/src/com/intellij/ide/projectView/BaseProjectTreeBuilder.java

@@ -28,6 +28,7 @@ import com.intellij.openapi.progress.Progressive;
 import com.intellij.openapi.progress.util.StatusBarProgress;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.*;
+import com.intellij.openapi.util.registry.Registry;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.wm.FocusRequestor;
 import com.intellij.openapi.wm.IdeFocusManager;
@@ -59,6 +60,7 @@ public abstract class BaseProjectTreeBuilder extends AbstractTreeBuilder {
                                 @NotNull AbstractTreeStructure treeStructure,
                                 @Nullable Comparator<NodeDescriptor> comparator) {
     init(tree, treeModel, treeStructure, comparator, DEFAULT_UPDATE_INACTIVE);
+    getUi().setClearOnHideDelay(Registry.intValue("ide.tree.clearOnHideTime"));
     myProject = project;
   }
 

platform/platform-api/src/com/intellij/ide/util/treeView/AbstractTreeUi.java

@@ -2299,7 +2299,7 @@ public class AbstractTreeUi {
   }
 
   public long getClearOnHideDelay() {
-    return myClearOnHideDelay > 0 ? myClearOnHideDelay : Registry.intValue("ide.tree.clearOnHideTime");
+    return myClearOnHideDelay;
   }
 
   @NotNull

platform/util/resources/misc/registry.properties

@@ -105,7 +105,10 @@ passwordSafe.memorySafe.ttl=-1
 ide.tree.yieldingUiUpdate=true
 ide.tree.showBusyIndicator=true
 ide.tree.waitForReadyTimeout=250
+
 ide.tree.clearOnHideTime=120000
+ide.tree.clearOnHideTime.description=Time in milliseconds when the hidden project view tree will be deactivated. 
+
 ide.tree.autoscrollToVCenter=true
 ide.tree.ensureSelectionOnFocusGained=true
 ide.tree.autoExpandMaxDepth=5