In GNU emacs, every time I hit Ctrl-x Ctrl-b to see all of my buffers, the window is split to show the buffer list, or if I have my window already split in 2 (for ins
Another not-what-you-asked-for solution: don't select the desired buffer with the mouse, rather finish typing its name (use tab-completion to reduce keystrokes and increase accuracy), then hit return. The buffer list will disappear, and the new file will be open in the previously active window.