fix(__load_completion): search completions in share/ from real path

Co-authored-by: Ville Skyttä <[email protected]>

Author: akinomyoga

bash_completion

@@ -2548,8 +2548,12 @@ __load_completion()
         dirs+=(./completions)
     fi
 
-    # 3) From bin directories extracted from path to command, and $PATH
-    [[ $cmd == */* ]] && paths=("${cmd%/*}") || paths=()
+    # 3) From bin directories extracted from the specified path to the command,
+    # the real path to the command, and $PATH
+    paths=()
+    [[ $cmd == */* ]] && paths+=("${cmd%/*}")
+    local ret
+    _comp_realcommand "$cmd" && paths+=("${ret%/*}")
     _comp_split -aF : paths "$PATH"
     for dir in "${paths[@]%/}"; do
         [[ $dir == ?*/@(bin|sbin) ]] &&