Bug(Derived from the official): Tabs(a[data-toggle="tab"][href="#..."]) push browser history twice about growi

[yuki-takei]

This problem couldn't be solved completely...
Unexpected behavior still caused in the following case.

How to reproduce?

1. Goto /admin/customize and enable "タブ変更をブラウザ履歴に保存" option
2. Access to wiki page A
3. Access to wiki page B
4. Click "Edit" tab ("#edit-form" hash will be added to url)
5. Browser back x N times

What happens?

• 1st back: page B with "#" is shown
• 2nd back: page B without hash is still shown
• 3rd back: page A is shown

What is the expected result?

• 1st back: page B (with or without "#") is shown
• 2nd back: page A is shown

[yuki-takei]

If this is annoying, disable "タブ変更をブラウザ履歴に保存" option.