Normalize Windows process PATH checks

install.ps1

@@ -303,6 +303,23 @@ function Normalize-PathForCompare($Path) {
     )
 }
 
+function PathList-Contains($PathValue, $PathToFind) {
+    if (-not $PathValue) {
+        return $false
+    }
+    $wanted = Normalize-PathForCompare $PathToFind
+    foreach ($entry in ($PathValue -split ';' | Where-Object { $_ })) {
+        try {
+            if ((Normalize-PathForCompare $entry) -ieq $wanted) {
+                return $true
+            }
+        }
+        catch {
+        }
+    }
+    return $false
+}
+
 function Assert-NoRelativePathSegments($Path) {
     foreach ($segment in ($Path -split '[\\/]')) {
         if ($segment -eq "." -or $segment -eq "..") {
@@ -339,7 +356,7 @@ function Add-UserPath($PathToAdd) {
         $entries = @($userPath -split ';' | Where-Object { $_ })
     }
     $wanted = Normalize-PathForCompare $PathToAdd
-    if (-not (";$env:Path;").Contains(";$PathToAdd;")) {
+    if (-not (PathList-Contains $env:Path $PathToAdd)) {
         $env:Path = "$PathToAdd;$env:Path"
     }
     foreach ($entry in $entries) {