Unexpected behaviour with page.is_homepage

[StarfallProjects]

Starting a new site and rolling my own theme. Came across some slightly odd behaviour.

Mkdocs version 1.0.4
Python version 3.7.1

Expected:
page.is_homepage evaluates to True on the home (index.md) of the site, and false on all other pages.

Actual:
page.is_homepage evaluates to True on the home (index.md), and on any other index.md that is included in the nav object without nesting.

Examples:

The unexpected result:

nav:
  - Home: index.md  <--- page.is_homepage evaluates to True
  - About: about.md <--- page.is_homepage evaluates to False
  - Projects: projects/index.md <--- page.is_homepage evaluates to True

Changing the filename causes it to evaluate to false:

nav:
  - Home: index.md  <--- page.is_homepage evaluates to True
  - About: about.md <--- page.is_homepage evaluates to False
  - Projects: projects/test.md <--- page.is_homepage evaluates to False

If I tweak it a bit, so that the sections are nested, then it evaluates to false as I'd expect:

nav:
  - About: 
      - About: about.md <--- page.is_homepage evaluates to False
  - Projects: 
       - Project home: projects/index.md <--- page.is_homepage evaluates to False

This feels like a bug - especially as simply changing the markdown file name causes the behaviour to change.

[waylan]

Yes, that's a bug. Thanks for the report.

mkdocs/mkdocs/structure/pages.py

Lines 94 to 96 in 98823e0

	@property
	def is_homepage(self):
	return self.is_top_level and self.is_index

We are only checking that the page is an index page at the root of the nav and not looking at the path at all. However, we do not require the nav to match the file structure. We simply need to add a check that the path is at the doc_dir root. Perhaps and '/' not in self.url.