Enhance Autocomplete for First Heading to Exclude File Path

[yuukibarns]

🚀 The feature, motivation and pitch

Description:

• Current Behavior:
  After typing: (| is the cursor)

  [Euler|]
  

  It is amazing to find the suggestion of the first heading of my markdown file which is Euler's Beta Function along with the suggestion of the filename euler_beta_function, but when I select it without confirming, it results in:

  [Euler's Beta Function](/path/to/file)|
  

• Desired Behavior:
  The unconfirmed suggestion should result in:

  [Euler's Beta Function|]
  

  This allows for adding tags like:

  [Euler's Beta Function#Property|]
  

  And then confirm:

  [Euler's Beta Function > Property.](/path/to/file)|