45624: vcs_info: Set $rrn in all backends.

Functions/VCS_Info/Backends/VCS_INFO_get_data_fossil

@@ -20,5 +20,6 @@ if [ -n "$merging" ]; then
    action="merging"
 fi
 
+rrn=${fsinfo[local_root]:t}
 VCS_INFO_formats "$action" "${fsbranch}" "${fsinfo[local_root]}" '' "$changed" "${fshash}" "${fsinfo[repository]}"
 return 0

Functions/VCS_Info/Backends/VCS_INFO_get_data_p4

@@ -17,6 +17,7 @@ local p4branch change
 # here down is synced as the revision.
 # I suppose the following might be slow on a tortuous client view.
 change="${${$(${vcs_comm[cmd]} changes -m 1 ...\#have)##Change }%% *}"
+rrn=${p4base:t}
 zstyle -s ":vcs_info:${vcs}:${usercontext}:${rrn}" branchformat p4branch || p4branch="%b:%r"
 hook_com=( branch "${p4info[Client_name]}" revision "${change}" )
 if VCS_INFO_hook 'set-branch-format' "${p4branch}"; then

Functions/VCS_Info/VCS_INFO_bydir_detect

@@ -36,4 +36,6 @@ done
 
 [[ ${basedir} == "/" ]] && return 1
 vcs_comm[basedir]=${basedir}
+# TODO: Would the following be correct? ---
+# rrn=${vcs_comm[basedir]:t}
 return 0