IDEA-119826 Do not require confirmation each time I open an IPR file

platform/platform-impl/src/com/intellij/ide/actions/OpenFileAction.java

@@ -118,13 +118,12 @@ public class OpenFileAction extends AnAction implements DumbAware {
         return;
       }
 
-      if (OpenProjectFileChooserDescriptor.isProjectFile(file)) {
-        int answer = Messages.showYesNoDialog(project,
-                                              IdeBundle.message("message.open.file.is.project", file.getName()),
-                                              IdeBundle.message("title.open.project"),
-                                              Messages.getQuestionIcon());
-        if (answer == Messages.YES) {
-          FileChooserUtil.setLastOpenedFile(ProjectUtil.openOrImport(file.getPath(), project, false), file);
+      if (OpenProjectFileChooserDescriptor.isProjectFile(file) &&
+          // if the ipr-based project is already open, just open the ipr file
+          (project == null || file != project.getProjectFile())) {
+        Project openedProject = ProjectUtil.openOrImport(file.getPath(), project, false);
+        if (openedProject != null) {
+          FileChooserUtil.setLastOpenedFile(openedProject, file);
           return;
         }
       }

platform/platform-resources-en/src/messages/IdeBundle.properties

@@ -399,7 +399,6 @@ title.popup.new.element=New
 title.popup.new.element.same.place=New in Current Directory
 command.go.to.next.split=Go to next split
 message.occurrence.N.of.M=Occurrence {0} of {1}
-message.open.file.is.project={0} is a project file.\nWould you like to open this project?
 error.files.of.this.type.cannot.be.opened=Files of this type cannot be opened in {0}
 title.cannot.open.file=Cannot Open File
 filter.all.file.types=All file types