Steps to reproduce the issue
Search a word inside text with accented letters that are expressed as as 2 characters.
Example : é as the unicode character U+02CA and the letter "e"

Expected result
The word searched is highlighted properly

Actual result
The highlighting is moved to the left by 1 or more pixel

System information (as much as possible)
Joomla 3.4.4 on any browsers

Additional comments

In the file '/components/com_search/views/search/view.html.php' at the lines 173 and 180 there is variable to check if the string without accents is longer than the one without accents ( stating : "E.g. german umlauts like ä are converted to ae and so $pos calculated with $srow doesn't match for $row" );

Since in my example the string without is shorter than the one with accents, the recalculation of the position isn't triggered.

I would suggest changing both lines to use "not equal" instead of "greater than" so that the recalculation of the position happens when both strings aren't the same length.

Line 173 :
FROM
$correctPos = (mb_strlen($srow) > mb_strlen($row));
TO
$correctPos = (mb_strlen($srow) != mb_strlen($row));

Line 180 :
FROM
$correctPos = (JString::strlen($srow) > JString::strlen($row));
TO
$correctPos = (JString::strlen($srow) != JString::strlen($row));

Sorry if this wasn't the proper way to report an issue, this is my first time.