Find dialog behaviour and appearence

[guest]

In all other PDF - Viewers, the text in the "Find" - Dialog is initially selected, so that typing a new word will delete the old text. I would prefer this behaviour over the current situation where newly typted search text is appended to the previous.

Also, the height of entry field in for the search text is much big. It is probably set up using the same height as the "O.K." button besides it, but since the text typed in is bottom-aligned, it looks kind of weird.

[Eugene Romanenko]

(In [185]) Improved size of input fields, initially select text in Find dialog (closes #103)