hgview #4121 search works incorrectly [validation pending]

When doing a search (Find textarea) on a big project, hgview has a few behaviors which are problematic :

• we loose focus of the window when searching
• when the result is found in a diff it doesn't scroll down to where it has highlighted the result
• the highlight is not always at the right place (line below for example)

For every find it would be nice to have the number of occurrences found in the selected diff displayed.