[orca] Don't clear cache on window in window:activate event

[Joanmarie Diggs <joanied src gnome org>]

commit 7b20f1e4990374fd21da0703a5d4183aff640c3c
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Tue Apr 24 12:33:52 2018 -0400

    Don't clear cache on window in window:activate event

 src/orca/scripts/default.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/scripts/default.py b/src/orca/scripts/default.py
index 4ae1ce5..a1d00a2 100644
--- a/src/orca/scripts/default.py
+++ b/src/orca/scripts/default.py
@@ -2739,7 +2739,7 @@ class Script(script.Script):
         - event: the Event
         """
 
-        if not self.utilities.canBeActiveWindow(event.source):
+        if not self.utilities.canBeActiveWindow(event.source, False):
             return
 
         if self.utilities.isSameObject(event.source, orca_state.activeWindow):