[ijent] IJPL-171863: Make posix files writeable on Windows if they are accessed under root

(cherry picked from commit dfe7efa7d4d3a5f471d1e5b8d338ea017ebcd145)

IJ-CR-150391

GitOrigin-RevId: ca555716293df310ec2301c8340dde55998e7637

platform/platform-impl/src/com/intellij/execution/wsl/ijent/nio/IjentWslNioFileSystemProvider.kt

@@ -414,6 +414,10 @@ class IjentNioPosixFileAttributesWithDosAdapter(
     val owner = owner()
     val group = group()
     return when {
+      userInfo.uid == 0 && owner is EelPosixUserPrincipal && owner.uid != 0 ->
+        // on unix, root can read everything except the files that they forbid for themselves
+        isDirectory
+
       owner is EelPosixUserPrincipal && owner.uid == userInfo.uid ->
         OWNER_WRITE !in permissions() || (isDirectory && OWNER_EXECUTE !in permissions())
 

platform/util/src/com/intellij/openapi/util/io/FileAttributes.java

@@ -211,6 +211,7 @@ public final class FileAttributes {
 
     boolean isHidden = false;
     boolean isWritable = false;
+    // TODO KN: We should look at the OS of a Path, not at the OS of the IDE.
     if (SystemInfo.isWindows) {
       isHidden = path.getParent() != null && ((DosFileAttributes)attrs).isHidden();
       isWritable = attrs.isDirectory() || !((DosFileAttributes)attrs).isReadOnly();