fix(compatdir): shadow compat files of the same name

Author: akinomyoga

bash_completion

@@ -3627,15 +3627,25 @@ _comp__init_collect_startup_configs()
         [[ ${compat_dirs[0]} == "$compat_dir" ]] ||
             compat_dirs+=("$compat_dir")
     fi
+    local -A compat_visited=()
     for compat_dir in "${compat_dirs[@]}"; do
         [[ -d $compat_dir && -r $compat_dir && -x $compat_dir ]] || continue
         local compat_files
         _comp_expand_glob compat_files '"$compat_dir"/*' || continue
         local compat_file
         for compat_file in "${compat_files[@]}"; do
             [[ ${compat_file##*/} != @($_comp_backup_glob|Makefile*|${BASH_COMPLETION_COMPAT_IGNORE-}) &&
-                -f $compat_file && -r $compat_file ]] &&
-                _comp__init_startup_configs+=("$compat_file")
+                -f $compat_file && -r $compat_file ]] || continue
+
+            # Disable the compat files with the same name as one of already
+            # selected ones.  This allows users to override a compat file with
+            # another file with the same name placed in an earlier directory in
+            # "${compat_dirs[@]}".
+            local name=${compat_file##*/}
+            [[ ${compat_visited[$name]-} ]] && continue
+            compat_visited[$name]=set
+
+            _comp__init_startup_configs+=("$compat_file")
         done
     done