When using location lists, multiple tabs, and switchbuf=usetab, I am seeing E924 errors that don't make sense. It seems that I can trigger one simply by selecting an entry in the location bar of one tab that corresponds to a file that is open in a window in another tab.

I don't see the same thing happen when using the quickfix list instead. In quickfix.c, I see that E924 cannot happen for the quickfix list, only for location lists. Why is that?

Any thoughts to explain what I'm seeing?

I can reproduce this as follows:

• Completely empty .vimrc except for "switchbuf=usetab"
• cd to directory with a number of files
• Open a file in tab 1
• Open a different file in tab 2
• From tab 2, use lgrep to search for a string in the first file
• When switching to first tab for a match, E924 error is displayed

This is just a guess, but is it the switching of tabs that is fooling the code into thinking that the window has been closed? Should win_valid() be win_valid_any_tab() instead?