[feat] When files are found in the installation directory, the installation should be terminated.

[keiko233]

Describe the problem

In the current NSIS setup, installation is allowed in any user-selected directory. During uninstallation, all files in the current path are removed. If there are additional files present in the selected path, non-program files will also be deleted incidentally.

Describe the solution you'd like

We can address this issue during installation by checking if the user-selected path contains existing files, thus preventing potential issues during uninstallation.

Alternatives considered

Perhaps there are alternative and more effective implementations, such as recording the program's files in the registry or exploring other solutions.

Additional context

I have written a sample code here. If allowed, I would like to initiate a pull request.
here keiko233@460519e

associated Links:
libnyanpasu/clash-nyanpasu@78b18de
libnyanpasu/clash-nyanpasu#657

[FabianLars]

If this is just about the uninstallation we can fix this as i described here instead.

In general i think allowing users to install the app into a not-empty folder is fine but maybe a dialog asking whether they're sure would be nice? 🤔 @amrbashir

[amrbashir]

An Ok/Cancel dialog should be fine here

[amrbashir]

@keiko233 if you want, please go ahead and open a PR to add a dialog to add an Ok/Cancel dialog

[keiko233]

@keiko233 if you want, please go ahead and open a PR to add a dialog to add an Ok/Cancel dialog

Maybe my problem has been solved.
#9282
I will close this issue.

[linguofeng]

Maybe that makes more sense, rather than having them mixed together 😅