IDEA-155300 Change non-sticky balloons behavior

platform/platform-impl/src/com/intellij/notification/impl/NotificationsManagerImpl.java

@@ -835,6 +835,7 @@ public class NotificationsManagerImpl extends NotificationsManager {
       .setCloseButtonEnabled(buttons == null)
       .setShowCallout(showCallout)
       .setShadow(false)
+      .setAnimationCycle(Registry.intValue("ide.new.notification.auto.hide.animation.time", 500))
       .setHideOnClickOutside(hideOnClickOutside)
       .setHideOnAction(hideOnClickOutside)
       .setHideOnKeyOutside(hideOnClickOutside)

platform/platform-impl/src/com/intellij/ui/BalloonImpl.java

@@ -857,6 +857,7 @@ public class BalloonImpl implements Balloon, IdeTooltip.Ui {
         mySmartFadeoutPaused = false;
       }
       else {
+        setAnimationEnabled(true);
         hide();
       }
     }
@@ -887,7 +888,12 @@ public class BalloonImpl implements Balloon, IdeTooltip.Ui {
       myFadeoutAlarm.cancelAllRequests();
       myFadeoutRequestMillis = System.currentTimeMillis();
       myFadeoutRequestDelay = fadeoutDelay;
-      myFadeoutAlarm.addRequest(this::hide, fadeoutDelay, null);
+      myFadeoutAlarm.addRequest(() -> {
+        if (mySmartFadeout) {
+          setAnimationEnabled(true);
+        }
+        hide();
+      }, fadeoutDelay, null);
     }
   }
 

platform/util/resources/misc/registry.properties

@@ -485,6 +485,7 @@ ide.ui.scale=1.0
 
 ide.new.notification.enabled=true
 ide.new.notification.visible.count=2
+ide.new.notification.auto.hide.animation.time=500
 
 ide.open.file.in.temp.project.dir=true
 ide.open.file.in.temp.project.dir.description=Enables opening file in temp project directory