[Bug 1976133] [NEW] resolvectl omits domains when mixing search and route params

[IRNPS]

Public bug reported:

Distributor ID: Ubuntu
Description:    Ubuntu 20.04.4 LTS
Release:        20.04
Codename:       focal

systemd 245 (245.4-4ubuntu3.16)
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid

When I execute:
sudo resolvectl domain neth0 ~example.com example.com
I expect:
Link 17 (neth0): ~example.com example.com

As per man:
"domain [LINK [DOMAIN...]] - The domain command expects valid DNS domains, possibly prefixed with "~", and configures a per-interface search or route-only domain."

What I get instead is:
sudo resolvectl domain neth0 ~example.com example.com

/etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf 
contains search example.com

resolvectl domain neth0
Link 17 (neth0): example.com

And:
sudo resolvectl domain neth0 example.com ~example.com

/etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf
contains no search line

resolvectl domain neth0
Link 17 (neth0): ~example.com

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- resolvectl truncates domains when mixing search and route params
+ resolvectl omits domains when mixing search and route params

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https://bugs.launchpad.net/bugs/1976133

Title:
  resolvectl omits domains when mixing search and route params

Status in systemd package in Ubuntu:
  New

Bug description:
  Distributor ID: Ubuntu
  Description:    Ubuntu 20.04.4 LTS
  Release:        20.04
  Codename:       focal

  systemd 245 (245.4-4ubuntu3.16)
  +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid

  When I execute:
  sudo resolvectl domain neth0 ~example.com example.com
  I expect:
  Link 17 (neth0): ~example.com example.com

  As per man:
  "domain [LINK [DOMAIN...]] - The domain command expects valid DNS domains, possibly prefixed with "~", and configures a per-interface search or route-only domain."

  What I get instead is:
  sudo resolvectl domain neth0 ~example.com example.com

  /etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf 
  contains search example.com

  resolvectl domain neth0
  Link 17 (neth0): example.com

  And:
  sudo resolvectl domain neth0 example.com ~example.com

  /etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf
  contains no search line

  resolvectl domain neth0
  Link 17 (neth0): ~example.com

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