I frequently use tag sources to search data for files with long filenames, that don't fit into the text input field of the search by dialog box. The starting value for the search string isn't visible completely, and this makes the necassary editing of the string more tedious than needed. This issue could be avoided if the window had a resize handle for making it wider.
Resize handles are available in practically all the other dialogs in mp3tag, so that text input fields can be enlarged as needed to ease editing of input strings, only this search box misses it.
