File-icons does not work with markdown-preview

[Ben3eeE]

The file-icons package does not work correctly with markdown-preview.

Reproduction Steps:

1. Open Atom in the atom/tabs package repository.
2. Ensure you have the Show Icons setting in the tabs package set to true.
3. Open README.md
4. Open markdown-preview with Ctrl-Shift-M

Expected behavior:

markdown-preview tab to have the icon from the file-icons package.

Observed behavior:

markdown-preview has the icon from the Show Icons setting.

Now reload Atom Ctrl-Alt-R

Expected behavior:

markdown-preview tab to have the same icon and nothing to change.

Observed behavior:

markdown-preview incorrectly aligned other icon. This does not happen without the file-icons package installed.

Atom version: 1.12.0-beta1
OS and version: Windows 7

Installed packages:

file-icons I disabled all other packages.

Additional information:

• Problem can be reproduced in safe mode: No
• Problem started happening recently, didn't happen in an older version of Atom: Dont know
• Problem can be reliably reproduced, doesn't happen randomly: Yes
• Problem happens with all files and projects, not only some files or projects: Only with markdown files, but with all markdown files.