Fix Scroll position not saved (issue #183)
Fix "ok" button in "Target path is already used by another transfer.Select another one." messagebox.
Get the rights values of position from session

The session manager was always reading (0,0) has the position of the page.
Correct a part of #183

There may be a better way of doing that.
Merge pull request #276 from sdfanq/master

Fix Scroll position not saved (issue #183)
Merge pull request #279 from sdfanq/fix_ok_btn

Fix "ok" button in "Target path is already used by another transfer." messagebox
Merge pull request #280 from Cqoicebordel/patch-3

Get the correct values of position from session
Minor fixes
Merge remote-tracking branch 'upstream/master'