Arch Linux

### Description

I recently received an update for the package `bspwm` and after the upgrade, I noticed that the behavior I noticed didn't align to how it configured it. After cursing Nvidia for breaking picom, I realized that the package provides `/usr/share/xsessions/bspwm.desktop` which overwrote my existing `bspwm.desktop` file.

On Debian based distributions, when the existing file differs than the new file provided in the package, the user is prompted as following:

```
Configuration file '$ABSOLUTE_FILE_PATH'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** $FILE (Y/I/N/O/D/Z) [default=N] ?
```

Something similar should be done to Pacman, more so because Arch Linux is a rolling release and the user should at least be informed about such a change.