Description of problem:
urpmi rewrites the file even when the user doesn't approve the action/installation of the packages

Version-Release number of selected component (if applicable):
urpmi-8.131

How reproducible:
100%

Steps to Reproduce:
1. in my specific case I wanted to install a specific package from testing repo to check the fix for bug#33893
since installing curl didn't also update the corresponding lib-packages I used:

# LC_ALL=C urpmi --searchmedia testing libcurl4 lib64curl4
Marking libcurl4 as manually installed, it won't be auto-orphaned
writing /var/lib/rpm/installed-through-deps.list
To satisfy dependencies, the following packages are going to be installed:
  Package                        Version      Release       Arch    
(medium "Core Updates Testing")
  lib64curl-devel                7.88.1       4.6.mga9      x86_64  
  lib64curl4                     7.88.1       4.6.mga9      x86_64  
(medium "Core 32bit Updates Testing")
  libcurl4                       7.88.1       4.6.mga9      i586    
12B of additional disk space will be used.
1.3MB of packages will be retrieved.
Proceed with the installation of the 3 packages? (Y/n) n

the 32bit libcurl4 is autodep of steam installation, and despite not continuing the operation the package got removed from the dep-list file.

I consider this a bug.

It would be nice if there was an option to skip updating the auto-orphans file for those cases (alternative would be to use exclude lists so that auto-select only leaves the desired packages, but that'd be quite tedious)

so:
 
1) the file should be updated when the action is actually performed, not prior to the user approving it

2) ideally there should be a switch to disable the removal when updating existing packages or a prompt like "do you want to remove the following packages from the installed-through-deps.list file" (I find more often than not that this is not what I want to happen when updating)