issues with embedded images

[l-jonas]

• Can you reproduce the bug at https://try.gitea.io:
  • Yes (https://try.gitea.io/jonas-l/rechnen-android)

Description

It looks like two images without something in between are processed wrongly. In the linked case, a browser http basic auth dialog is shown. When scrolling down, then there is a row with one image and to the right of it, there is just the alternative text. The first image path is correctly https://try.gitea.io/jonas-l/rechnen-android/media/branch/master/art/old-1.png, the second one is https://try.gitea.io/jonas-l/art/old-2.png in the rendered version which does not work. In the source code, both are just relative urls:

![old config screen](./art/old-1.png)
![old training screen](./art/old-2.png)

...

Screenshots

GitHub always rejected my screenshot uploads ...

[jolheiser]

Duplicate of #10484