I have several files in my test directory that all start with 'test_'. I frequently use autocomplete to specify one of these files to edit or run. When I press tab to autocomplete, zsh correctly fills in 'test_' but then moves the cursor back one letter to between the 't' and '_'. I want to be able to type in the first distinguishing letter(s) of the file I want so I can press tab again to complete the full filename, but I have to press right arrow every time to get to where I can do that.
How do I get zsh to stop backspacing like that?