Very important productivity option.
I'm using two windows daily recreating semi Total Commander / Midnight Commander layout (of any commander). Both have 7 workspaces with the same icons, but other names and contents. WS3s are used as communication areas with Opera forums. I need to move my tabs from one window to the second one and vice versa, sometimes (well, rather frequently). Not having the option (named in title) I have to think first where to start opening new tabs, but thinking out it in advance is not always possible.
Either it be done via drag'n'drop, or context menu (preferred) is not so important. What is salient point, is availability of the option!
P.S. The only way to make up for lack of the option is to select the tabs I want to read then use context menu to click Save tabs as Speed Dial folder and close them (Ctrl+W - Close the tabs). Next move the focus to the WS you use and open new Folder in it. Due to the fact that the Speed Dial aka Opera cach is common for all Opera windows!
I've learned by the way that the context menu for saving selected tabs originally Save all tabs as Speed Dial folder changes its name to Save tabs as Speed Dial folder (without all). It's obvious that the other menu should be named Save selected tabs as Speed Dial folder.
What a mess! All over Opera such bombs/mines are placed yet. Why Opera browser is not being finished yet in 100%?