Add boolean `Supplements` to file manager add-on subpackages.

Use `install -p` to preserve mtimes.

nextcloud-client.spec

@@ -99,6 +99,7 @@ Development headers for use of the nextcloud-client library
 
 %package nautilus
 Summary: nextcloud client nautilus extension
+Supplements: (nextcloud-client and nautilus)
 Requires: nautilus
 Requires: nautilus-python
 Requires: %{name}%{?_isa} = %{version}-%{release}
@@ -112,6 +113,7 @@ The nextcloud desktop client nautilus extension.
 # Only Fedora has Cinnamon, so there is no need for Nemo extension on EPEL
 %package nemo
 Summary:        Nemo overlay icons
+Supplements:    (nextcloud-client and nemo)
 Requires:       nemo
 Requires:       nemo-python
 Requires: %{name}%{?_isa} = %{version}-%{release}
@@ -123,6 +125,7 @@ in the nemo file manager.
 # Only Fedora has Mate, so there is no need for Caja extension on EPEL
 %package caja
 Summary:        Caja overlay icons
+Supplements:    (nextcloud-client and caja)
 Requires:       caja
 Requires:       python3-caja
 Requires: %{name}%{?_isa} = %{version}-%{release}
@@ -135,6 +138,7 @@ in the caja file manager.
 %if 0%{?fedora} || 0%{?rhel} > 7
 %package dolphin
 Summary:        Dolphin overlay icons
+Supplements:    (nextcloud-client and dolphin)
 Requires:       dolphin
 Requires: %{name}%{?_isa} = %{version}-%{release}
 
@@ -163,7 +167,7 @@ sed -i 's/-fPIE/-fPIC/g' src/cmd/CMakeLists.txt
 
 %find_lang client --with-qt
 mkdir -p %{buildroot}%{_datadir}/appdata/
-install -m 644 %{SOURCE1} %{buildroot}%{_datadir}/appdata/nextcloud.appdata.xml
+install -pm 644 %{SOURCE1} %{buildroot}%{_datadir}/appdata/nextcloud.appdata.xml
 
 
 # for distros that do not have KDE Plasma 5