Breadcrumb backstack

Description

Change the way we handle the backstack for browsing files.

• Store the complete file path in PathAdapter to avoid false positive when substituing
• Make sure the backstack is always complete even when using favorites shortcuts

Motivation and Context

How Has This Been Tested?

Screenshots / GIFs (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking change which cleans up / improves existing functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING section of the README document.

Resolves

Fixes: #944 (closed)