david <davidimagid@gmail.com> writes:

> Hi Emacs developers,
>
> I found a bug in the `describe-package` interface.  Here are the steps
> to reproduce it:
>
> 1. Open Emacs and run `M-x list-packages RET`.
> 2. Click on a package that is already installed (Status: Installed).
> 3. In the "Other versions" section, click on the same version that is
>    already installed.
> 4. The package description now shows "Install" even though the package
>    is already installed.
> 5. If you click "Install", the package is reinstalled, and the "Other
>    versions" section shows the same version twice as installed.
>
> The same behavior occurs for packages with Status: dependency.  The
> difference is that when you click "Install" in `describe-package`, the
> package changes its status in `list-packages` from "dependency" to
> "installed".  Additionally, the package appears duplicated in the "Other
> versions" section.  However, after restarting Emacs, the package returns
> to its original "dependency" status in `list-packages`.
>
> Expected behavior:
> - The "Install" button should not be shown if the package is already
>   installed.  Alternatively, the button could be renamed to "Reinstall"
>   or replaced with a "Delete" button to better reflect the available
>   actions for an already installed package.
> - The "Other versions" section should not display duplicate entries for
>   the same installed version.  If you click "Install" again, the package
>   is overwritten, and a third duplicate entry appears as installed.

I believe the following patch should address these issues: