If a file's already open in the window, don't edit it again.

[PhilRunninger]

Description of Changes

Closes #1102

The issue can be recreated without NERDTree using these commands that simulate what NERDTree does:

$ echo "hello" > world.txt
$ vim

:set noconfirm
:e world.txt
:copy 0
:vsplit
:e world.txt

The solution is to skip the second :e world.txt command if the file is already open in the new window. This fixes a regression introduced in #1098.

---

New Version Info

Author's Instructions

• Derive a new MAJOR.MINOR.PATCH version number. Increment the:
  • MAJOR version when you make incompatible API changes
  • MINOR version when you add functionality in a backwards-compatible manner
  • PATCH version when you make backwards-compatible bug fixes
• Update CHANGELOG.md, following the established pattern.

Collaborator's Instructions

• Review CHANGELOG.md, suggesting a different version number if necessary.
• After merge, tag the merge commit, e.g. git tag -a 3.1.4 -m "v3.1.4" && git push origin --tags

[scrawld]

Hello, I can't open the file after upgrading nerdtree to 6.7.6

Error detected while processing function nerdtree#ui_glue#invokeKeyMap[1]..80[18]..79[3]..30_customOpenFile[1]..109[1]..125[3]..181[6]..182[17]..16:
line 2:
E119: Not enough arguments for function: bufname
E15: Invalid expression: bufname() !=# l:bufname

[scrawld]

[thomasvm]

Upgrading to vim 8.2 fixed the problem for me personally, but I guess this plugin wants to maintain some kind of backwards compatibility for older vim versions.

[PhilRunninger]

Yes, the bufname() implementation changed in 8.2, such that the argument is optional. I fixed this in #1105

[btjanaka]

This is awesome; I just encountered this error from installing NERDTree last night and it's already fixed. Thanks!

[scrawld]

Thanks, I upgraded vim to 8.2 and the problem was solved

[scrawld]

Today I have a new problem.
When use NERDTree to open a file in a directory, it opens a directory instead.
The cause of this problem is that I moved the directory of the file.

[PhilRunninger]

@scrawld, can you open a new issue for this and provide more detail about how to recreate it?

Thanks!