files copied from native file manager can be pasted into IDEA (part of IDEADEV-40725)

platform/lang-impl/src/com/intellij/ide/CopyPasteDelegator.java

@@ -101,6 +101,7 @@ public abstract class CopyPasteDelegator implements CopyPasteSupport {
         for(PasteProvider provider: Extensions.getExtensions(EP_NAME)) {
           if (provider.isPasteEnabled(dataContext)) {
             provider.performPaste(dataContext);
+            break;
           }
         }
       }

platform/lang-impl/src/com/intellij/ide/FileListPasteProvider.java

@@ -0,0 +1,71 @@
+package com.intellij.ide;
+
+import com.intellij.openapi.actionSystem.DataContext;
+import com.intellij.openapi.actionSystem.LangDataKeys;
+import com.intellij.openapi.ide.CopyPasteManager;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vfs.LocalFileSystem;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiDirectory;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFileSystemItem;
+import com.intellij.psi.PsiManager;
+import com.intellij.refactoring.copy.CopyFilesOrDirectoriesHandler;
+
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.Transferable;
+import java.awt.datatransfer.UnsupportedFlavorException;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author yole
+ */
+public class FileListPasteProvider implements PasteProvider {
+  public void performPaste(DataContext dataContext) {
+    Project project = LangDataKeys.PROJECT.getData(dataContext);
+    final IdeView ideView = LangDataKeys.IDE_VIEW.getData(dataContext);
+    if (project == null || ideView == null) return;
+    List<File> fileList;
+    try {
+      final Transferable contents = CopyPasteManager.getInstance().getContents();
+      //noinspection unchecked
+      fileList = (List<File>)contents.getTransferData(DataFlavor.javaFileListFlavor);
+    }
+    catch (UnsupportedFlavorException e) {
+      return;
+    }
+    catch (IOException e) {
+      return;
+    }
+    List<PsiElement> elements = new ArrayList<PsiElement>();
+    for (File file : fileList) {
+      final VirtualFile vFile = LocalFileSystem.getInstance().refreshAndFindFileByIoFile(file);
+      if (vFile != null) {
+        final PsiManager instance = PsiManager.getInstance(project);
+        PsiFileSystemItem item = vFile.isDirectory() ? instance.findDirectory(vFile) : instance.findFile(vFile);
+        if (item != null) {
+          elements.add(item);
+        }
+      }
+    }
+    if (elements.size() > 0) {
+      final PsiDirectory dir = ideView.getOrChooseDirectory();
+      if (dir != null) {
+        new CopyFilesOrDirectoriesHandler().doCopy(elements.toArray(new PsiElement[elements.size()]), dir);
+      }
+    }
+  }
+
+  public boolean isPastePossible(DataContext dataContext) {
+    return true;
+  }
+
+  public boolean isPasteEnabled(DataContext dataContext) {
+    final Transferable contents = CopyPasteManager.getInstance().getContents();
+    final IdeView ideView = LangDataKeys.IDE_VIEW.getData(dataContext);
+    return contents.isDataFlavorSupported(DataFlavor.javaFileListFlavor) && ideView != null;
+  }
+}

platform/platform-resources/src/META-INF/LangExtensions.xml

@@ -519,4 +519,6 @@
 
   <projectService serviceInterface="com.intellij.openapi.vcs.changes.ui.ChangesFileNameDecorator"
                   serviceImplementation="com.intellij.openapi.vcs.changes.ui.WolfChangesFileNameDecorator"/>
+
+  <filePasteProvider implementation="com.intellij.ide.FileListPasteProvider"/>
 </extensions>