From 4885c0aebbece72e1ca4d6e3c753eb08af4518c7 Mon Sep 17 00:00:00 2001
From: Sergey Malenkov <sergey.malenkov@jetbrains.com>
Date: Wed, 1 Jul 2015 18:02:15 +0300
Subject: [PATCH] IDEA-140989 Cannot select item from completion popup using
 mouse

---
 .../src/com/intellij/ui/BalloonImpl.java        | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/platform/platform-impl/src/com/intellij/ui/BalloonImpl.java b/platform/platform-impl/src/com/intellij/ui/BalloonImpl.java
index 8c593a69d52c..d60649e096a0 100644
--- a/platform/platform-impl/src/com/intellij/ui/BalloonImpl.java
+++ b/platform/platform-impl/src/com/intellij/ui/BalloonImpl.java
@@ -106,7 +106,7 @@ public class BalloonImpl implements Balloon, IdeTooltip.Ui {
         final boolean insideBalloon = isInsideBalloon(me);
 
         if (myHideOnMouse && id == MouseEvent.MOUSE_PRESSED) {
-          if (!insideBalloon && !hasModalDialog(me)) {
+          if (!insideBalloon && !hasModalDialog(me) && !isWithinChildWindow(me)) {
             hide();
           }
           return;
@@ -159,6 +159,21 @@ public class BalloonImpl implements Balloon, IdeTooltip.Ui {
     }
   };
 
+  private boolean isWithinChildWindow(MouseEvent event) {
+    Component owner = UIUtil.getWindow(myContent);
+    if (owner != null) {
+      Component child = UIUtil.getWindow(event.getComponent());
+      if (child != owner) {
+        for (; child != null; child = child.getParent()) {
+          if (child == owner) {
+            return true;
+          }
+        }
+      }
+    }
+    return false;
+  }
+
   private static boolean hasModalDialog(MouseEvent e) {
     final Component c = e.getComponent();
     final DialogWrapper dialog = DialogWrapper.findInstance(c);