Not taking .gitignore into account for files created after starting up vim

[johnnovak]

Problem description

The gitignore settings are only taken into account for the files that existed when starting vim, not for files created afterwards.

Steps to reproduce

Setup a new repo for the tests:

mkdir test
cd test
touch a a~ b b~ c
git init
echo "*~" > .gitignore

Test 1

1. Start vim
2. :set backup (to make sure backup files get created in the same directory with ~ appended to the end of the filename)
3. Open the file browser, observe that you can toggle with Shift-I whether the files a~ and b~ are shown.
4. Open file c and save it while the file browser is open. Note that c~ gets created and it gets shown in the browser, but Shift+I won't hide it like the rest of the backup files; it is always shown.
5. NvimTreeRefresh or opening/closing the browser doesn't help; c~ will be always shown.
6. Restart vim and open the file browser again. Now c~ gets toggled correctly too with Shift-I.

Test 2

1. Start vim
2. Open the file browser, observe that you can toggle with Shift-I whether the files a~ and b~ are shown.
3. Create a new file called x~ from another shell while vim is open.
4. Press Shift+R in the file browser to refresh the view; note that x~ is now shown.
5. Similarly to Test1, Shift+I will toggle the backup files that existed at startup, but not x~.

Conclusion

Somehow the gitignore is taken into account only for the state of the filesystem at startup (?), but not for files created from vim.

[johnnovak]

Thanks guys!