Pasting long lines in sample registration form input window

[grulisco]

With #2658 powerful pasting capabilities were introduced.

When pasting long text per line the dialog is kind of confusing, because of the line feeds in the edit area. The alignment to the line numbers on the left is wrong, see

Nevertheless it works as expected.

I propose to remove the automatic line break in the input area and/or to enable resizing the dialog on demand also horizontally (it works only vertically).

[Bugerman58]

PR is welcome :)