[gnome-shell] Check that no new term was introduced before doing a subsearch

[Marina Zhurakhinskaya <marinaz src gnome org>]

commit aed1e67addc8e9661cb34856d42713d2f1d44a58
Author: Marina Zhurakhinskaya <marinaz redhat com>
Date:   Mon Oct 5 13:50:58 2009 -0400

    Check that no new term was introduced before doing a subsearch
    
    We combine search terms with OR, so if a new search term is introduced,
    the search results are no longer a subset of the previous search results.

 js/ui/genericDisplay.js |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/genericDisplay.js b/js/ui/genericDisplay.js
index e15df20..cbd211f 100644
--- a/js/ui/genericDisplay.js
+++ b/js/ui/genericDisplay.js
@@ -370,7 +370,11 @@ GenericDisplay.prototype = {
             return;
         let flags = RedisplayFlags.RESET_CONTROLS;
         if (this._search != '') {
-            if (lowertext.indexOf(this._search) == 0)
+            // Because we combine search terms with OR, we have to be sure that no new term
+            // was introduced before deciding that the new search results will be a subset of
+            // the existing search results.
+            if (lowertext.indexOf(this._search) == 0 &&
+                lowertext.split(/\s+/).length == this._search.split(/\s+/).length)
                 flags |= RedisplayFlags.SUBSEARCH;
         }
         this._search = lowertext;