[Bug] Display error in `Open PR Comparing changes`

[JimMoen]

Description

In opening PR comparing page.
When octotree was pined as side bar and the comparing style is split,
the file info would be shadowed by octotree sidebar.

Environment (if bug)

• Octotree version: v7.3.0
• Browser & version: Google Chrome 97.0.4692.71 / Chromium 97.0.4692.71
• OS & version: Arch Linux, Kernel 5.16.1.zen1-1
• Screenshot