PE: Close generated files silently if they have an editor

Omits the original request whether to save a modified file
if the files are opened inside QC, but it ensures to format
the correct file content instead of using some cached
content.

Fixes: QTCREATORBUG-29904
Change-Id: I3b3f3e53fb811288a208376559243bea01d0d4a4
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/projectexplorer/jsonwizard/jsonwizard.cpp

@@ -11,6 +11,7 @@
 #include "../projectexplorertr.h"
 #include "../projecttree.h"
 
+#include <coreplugin/editormanager/documentmodel.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/editormanager/ieditor.h>
 #include <coreplugin/messagemanager.h>
@@ -351,6 +352,14 @@ void JsonWizard::accept()
         return;
     }
 
+    const QList<Core::IDocument *> documentsToClose
+        = transform(m_files, [](const GeneratorFile &file) -> Core::IDocument * {
+              if ((file.file.attributes() & Core::GeneratedFile::OpenEditorAttribute) == 0)
+                  return nullptr;
+              return Core::DocumentModel::documentForFilePath(file.file.filePath());
+          });
+    Core::EditorManager::closeDocuments(documentsToClose, /*askAboutModifiedEditors=*/false);
+
     emit preWriteFiles(m_files);
     if (!JsonWizardGenerator::writeFiles(this, &m_files, &errorMessage)) {
         if (!errorMessage.isEmpty())