Improve the highlighting

When the user displays the highlighted text in the preview the cursor should jump to the highlighted text or the first highlighted instance. Currently the the preview only shows the file from the start of the text so the user has to scroll down through perhaps many pages looking for the "faintly" highlighted text. Unfortunately sometimes he/she wont find it because:

Work needs to be done on the highlighting because if the keyword is a phrase (more than one word), and the phrase is partially at the end of a line and wraps round to the next line in the preview NONE of the words of the key phrase is currently highlighted.