Tab completion with spaces does not work

[certik]

If the directory (or a file) has spaces in it, the tab completion does not work.

[certik]

Here is an example on macOS:

First it correctly tab completes up to ~/Library/Application S, but then when I press u, the further tab completion does not work. It needs to escape the path, either with \ for the space, or put the whole path into '.

[certik]

Now the ~/Library/App<TAB correctly completes to ~/Library/Application\ S, but then it stops completing after that. So an improvement, but still not fixed.