Select applicable editor for text content

The Untitled Text File wizard creates an empty temporary file with no
file name suffix. Previously, the wizard would interrogate the editor
registry to select the default editor based on file name only. We now
specify the text content type when looking up the default editor to
avoid the possibility of opening the new file in an editor that is
associated with files having no file name suffix but is not appropriate
for text content.

bundles/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/text/UntitledTextFileWizard.java

@@ -17,6 +17,8 @@
 import org.eclipse.core.filesystem.IFileStore;
 
 import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.content.IContentType;
 
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.wizard.Wizard;
@@ -40,6 +42,8 @@
  */
 public class UntitledTextFileWizard extends Wizard implements INewWizard {
 
+	private static final String TEXT_CONTENT_TYPE_ID= "org.eclipse.core.runtime.text"; //$NON-NLS-1$
+
 	private IWorkbenchWindow fWindow;
 
 	public UntitledTextFileWizard() {
@@ -59,7 +63,8 @@ private IFileStore queryFileStore() {
 	private String getEditorId(IFileStore fileStore) {
 		IWorkbench workbench= fWindow.getWorkbench();
 		IEditorRegistry editorRegistry= workbench.getEditorRegistry();
-		IEditorDescriptor descriptor= editorRegistry.getDefaultEditor(fileStore.getName());
+		IContentType textContentType= Platform.getContentTypeManager().getContentType(TEXT_CONTENT_TYPE_ID);
+		IEditorDescriptor descriptor= editorRegistry.getDefaultEditor(fileStore.getName(), textContentType);
 		if (descriptor != null)
 			return descriptor.getId();
 		return EditorsUI.DEFAULT_TEXT_EDITOR_ID;