brew plugin was not calculating the number of paths to ignore correctly

plugins/brew/brew.load

@@ -2,7 +2,7 @@ set -l brew_paths /usr/local/bin /usr/bin /bin /usr/local/sbin /usr/sbin /sbin
 
 # Append all existing brew paths to PATH
 set -l existing_brew_paths
-for brew_path in $brew_paths[-1..1]
+for brew_path in $brew_paths
   if test -d $brew_path
     set PATH $PATH $brew_path
     set existing_brew_paths $existing_brew_paths $brew_path
@@ -10,9 +10,9 @@ for brew_path in $brew_paths[-1..1]
 end
 
 # Remove brew paths from tail to head that were not recently added
-set -l existing_brew_paths_count (count $existing_brew_paths_count + 1)
+set -l number_of_paths_to_ignore (math (count $PATH) - (count $existing_brew_paths))
 for i in (seq (count $PATH))[-1..1]
-  if test $i -le $existing_brew_paths_count
+  if test $i -le $number_of_paths_to_ignore
     if contains $PATH[$i] $brew_paths
       set -e PATH[$i]
     end