IDEA-85995: Remove unneeded code and constant

platform/platform-api/src/com/intellij/execution/util/ExecUtil.java

@@ -150,7 +150,7 @@ public class ExecUtil {
     final GeneralCommandLine sudoCommandLine;
     if (SystemInfo.isWinVistaOrNewer) {
       // launcher.exe process with elevated permissions on UAC.
-      final File launcherExe = PathManager.findBinFileWithException(PathManager.WIN_LAUNCHER);
+      final File launcherExe = PathManager.findBinFileWithException("launcher.exe");
       sudoCommandLine = new GeneralCommandLine(launcherExe.getPath());
       sudoCommandLine.setWorkDirectory(commandLine.getWorkDirectory());
       sudoCommandLine.addParameter(commandLine.getExePath());

platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/UpdateInstaller.kt

@@ -136,7 +136,7 @@ object UpdateInstaller {
 
     if (SystemInfo.isWindows) {
       // launcher depends on elevator
-      val launcher = PathManager.findBinFile(PathManager.WIN_LAUNCHER)
+      val launcher = PathManager.findBinFile("launcher.exe")
       val elevator = PathManager.findBinFile("elevator.exe")
       if (launcher !=null && elevator != null && launcher.canExecute()) {
         args += Restarter.createTempExecutable(launcher, elevator).path

platform/util/src/com/intellij/openapi/application/PathManager.java

@@ -55,10 +55,6 @@ public class PathManager {
   public static final String PROPERTY_LOG_PATH = "idea.log.path";
   public static final String PROPERTY_PATHS_SELECTOR = "idea.paths.selector";
   public static final String DEFAULT_OPTIONS_FILE_NAME = "other";
-  /**
-   * Tool to launch any command under UAC
-   */
-  public static final String WIN_LAUNCHER = "launcher.exe";
 
   private static final String PROPERTY_HOME = "idea.home";  // reduced variant of PROPERTY_HOME_PATH, now deprecated
 

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

@@ -480,17 +480,7 @@ public class FileUtil extends FileUtilRt {
   @SuppressWarnings("Duplicates")
   private static void performCopy(@NotNull File fromFile, @NotNull File toFile, final boolean syncTimestamp) throws IOException {
     if (filesEqual(fromFile, toFile)) return;
-    final FileOutputStream fos;
-    try {
-      fos = openOutputStream(toFile);
-    }
-    catch (IOException e) {
-      if (SystemInfo.isWindows && e.getMessage() != null && e.getMessage().contains("denied") &&
-          nativeWindowsCopy(fromFile, toFile)) {
-        return;
-      }
-      throw e;
-    }
+    final FileOutputStream fos = openOutputStream(toFile);
 
     try {
       final FileInputStream fis = new FileInputStream(fromFile);
@@ -520,33 +510,6 @@ public class FileUtil extends FileUtilRt {
     }
   }
 
-  private static boolean nativeWindowsCopy(@NotNull final File src, @NotNull final File dst) {
-    final File launcher = PathManager.findBinFile(PathManager.WIN_LAUNCHER);
-    if (launcher == null || !launcher.exists()) {
-      return false;
-    }
-
-    try {
-      final ProcessBuilder builder =
-        new ProcessBuilder(launcher.getAbsolutePath(), "cmd.exe", "/C", "copy", src.getAbsolutePath(), dst.getAbsolutePath());
-      final Process process = builder.start();
-
-      final String error = StreamUtil.readText(process.getErrorStream(), Charset.defaultCharset());
-      final String out = StreamUtil.readText(process.getInputStream(), Charset.defaultCharset());
-      LOG.info("out" + out);
-      LOG.info("error" + error);
-      return process.waitFor() == 0;
-    }
-    catch (final IOException ex) {
-      LOG.warn(ex);
-      return false;
-    }
-    catch (final InterruptedException ex) {
-      LOG.warn(ex);
-      return false;
-    }
-  }
-
   private static FileOutputStream openOutputStream(@NotNull final File file) throws IOException {
     try {
       return new FileOutputStream(file);