[desktop] begin movable icons
[desktop] sync prefdlg prefdlg2
[desktop] non-custom sort dont allow move #256
[desktop] drop on text line next #256; auto drag action
[desktop] context menu base on focused item
[desktop] new image load thumbnail
[desktop] extend prefs dlg
[desktop] prefs added margins, desktop single click
[desktop] add Open|Desktop Folder
[desktop] layout all on delete
[desktop] desktop name sort natural icase
[desktop] save/load Custom icon positions #256
[desktop] fix --disable-desktop-integration
keep saved tabs on desktop save settings
fix desktop center wallpaper larger than screen #296