[LyX/master] Revert "Update previews after doing a find/replace (#7242)"

[Scott Kostyshak]

commit a7a143950a9c770be022b20cba760f5f9ef7b333
Author: Scott Kostyshak <skost...@lyx.org>
Date:   Fri Nov 13 00:50:39 2015 -0500

    Revert "Update previews after doing a find/replace (#7242)"
    
    Updating all previews (even if only one has changed) is more costly
    than I thought. Thanks to Guillaume for tracking down this
    performance issue.
    
    This reversion is related to the reversion at 358745d0.
    See also #7242 and #9855.
    
    This reverts commit 66f527e417de916105680696bd44d7ad91ff60cb.

diff --git a/src/lyxfind.cpp b/src/lyxfind.cpp
index 2f7a0b4..f46bed9 100644
--- a/src/lyxfind.cpp
+++ b/src/lyxfind.cpp
@@ -385,7 +385,6 @@ bool lyxreplace(BufferView * bv,
                else
                        bv->message(_("String not found."));
        }
-       bv->buffer().updatePreviews();
        return update;
 }