Selecting multiline text without carriage returns or new line characters

While this might e practical for some of us others would run in big problems: I often selecte addresses to copy tehm to a different program - would not like to have my lines concatenated then... It could be a possibility to remove \n when you start with the selection botom-right and terminate top-left, and to keep \n when you start top-left and terminate botom-right. However: there are programs that use botom-right to top-left to select a block, while top-lfet to botom-right selects the complete (flow-)text (SumatraPDF selects today in both cases the complete flowtext). I for myself would love to see the block selection - this is extremely useful to select parts of a formated text (columns, tabs)! I hope this to be understandable, it would be hard to create a visualisation of this...