Version control: Do not keep lock on message file while committing.

Store the file name and do not keep the QTemporaryFile around,
which still seems to maintain some kind of lock on Windows although
it is closed.

src/plugins/perforce/perforceplugin.cpp

@@ -189,7 +189,6 @@ PerforcePlugin::PerforcePlugin() :
     m_diffSelectedFiles(0),
     m_undoAction(0),
     m_redoAction(0),
-    m_changeTmpFile(0),
     m_versionControl(0)
 {
 }
@@ -547,28 +546,29 @@ void PerforcePlugin::submit()
         return;
     }
 
-    if (m_changeTmpFile) {
+    if (isCommitEditorOpen()) {
         VCSBase::VCSBaseOutputWindow::instance()->appendWarning(tr("Another submit is currently executed."));
         return;
     }
 
-    m_changeTmpFile = new QTemporaryFile(this);
-    m_changeTmpFile->setAutoRemove(true);
-    if (!m_changeTmpFile->open()) {
+    QTemporaryFile changeTmpFile;
+    changeTmpFile.setAutoRemove(false);
+    if (!changeTmpFile.open()) {
         VCSBase::VCSBaseOutputWindow::instance()->appendError(tr("Cannot create temporary file."));
-        cleanChangeTmpFile();
+        cleanCommitMessageFile();
         return;
     }
 
     PerforceResponse result = runP4Cmd(QStringList()<< QLatin1String("change") << QLatin1String("-o"), QStringList(),
                                        CommandToWindow|StdErrToWindow|ErrorToWindow);
     if (result.error) {
-        cleanChangeTmpFile();
+        cleanCommitMessageFile();
         return;
     }
 
-    m_changeTmpFile->write(result.stdOut.toAscii());
-    m_changeTmpFile->close();
+    m_commitMessageFileName = changeTmpFile.fileName();
+    changeTmpFile.write(result.stdOut.toAscii());
+    changeTmpFile.close();
 
     // Assemble file list of project
     QString name;
@@ -576,7 +576,7 @@ void PerforcePlugin::submit()
     PerforceResponse result2 = runP4Cmd(QStringList(QLatin1String("fstat")), nativeFiles,
                                         CommandToWindow|StdErrToWindow|ErrorToWindow);
     if (result2.error) {
-        cleanChangeTmpFile();
+        cleanCommitMessageFile();
         return;
     }
 
@@ -588,11 +588,11 @@ void PerforcePlugin::submit()
     }
     if (depotFileNames.isEmpty()) {
         VCSBase::VCSBaseOutputWindow::instance()->appendWarning(tr("Project has no files"));
-        cleanChangeTmpFile();
+        cleanCommitMessageFile();
         return;
     }
 
-    openPerforceSubmitEditor(m_changeTmpFile->fileName(), depotFileNames);
+    openPerforceSubmitEditor(m_commitMessageFileName, depotFileNames);
 }
 
 Core::IEditor *PerforcePlugin::openPerforceSubmitEditor(const QString &fileName, const QStringList &depotFileNames)
@@ -983,19 +983,22 @@ void PerforcePlugin::submitCurrentLog()
     em->closeEditors(QList<Core::IEditor*>() << em->currentEditor());
 }
 
-void PerforcePlugin::cleanChangeTmpFile()
+void PerforcePlugin::cleanCommitMessageFile()
 {
-    if (m_changeTmpFile) {
-        if (m_changeTmpFile->isOpen())
-            m_changeTmpFile->close();
-        delete m_changeTmpFile;
-        m_changeTmpFile = 0;
+    if (!m_commitMessageFileName.isEmpty()) {
+        QFile::remove(m_commitMessageFileName);
+        m_commitMessageFileName.clear();
     }
 }
 
+bool PerforcePlugin::isCommitEditorOpen() const
+{
+    return !m_commitMessageFileName.isEmpty();
+}
+
 bool PerforcePlugin::editorAboutToClose(Core::IEditor *editor)
 {
-    if (!m_changeTmpFile || !editor)
+    if (!editor || !isCommitEditorOpen())
         return true;
     Core::ICore *core = Core::ICore::instance();
     Core::IFile *fileIFace = editor->file();
@@ -1005,7 +1008,7 @@ bool PerforcePlugin::editorAboutToClose(Core::IEditor *editor)
     if (!perforceEditor)
         return true;
     QFileInfo editorFile(fileIFace->fileName());
-    QFileInfo changeFile(m_changeTmpFile->fileName());
+    QFileInfo changeFile(m_commitMessageFileName);
     if (editorFile.absoluteFilePath() == changeFile.absoluteFilePath()) {
         // Prompt the user. Force a prompt unless submit was actually invoked (that
         // is, the editor was closed or shutdown).
@@ -1029,12 +1032,13 @@ bool PerforcePlugin::editorAboutToClose(Core::IEditor *editor)
         fileIFace->save();
         core->fileManager()->unblockFileChange(fileIFace);
         if (answer == VCSBase::VCSBaseSubmitEditor::SubmitConfirmed) {
-            if (!m_changeTmpFile->open()) {
+            QFile commitMessageFile(m_commitMessageFileName);
+            if (!commitMessageFile.open(QIODevice::ReadOnly|QIODevice::Text)) {
                 VCSBase::VCSBaseOutputWindow::instance()->appendError(tr("Cannot open temporary file."));
                 return false;
             }
-            QByteArray change = m_changeTmpFile->readAll();
-            m_changeTmpFile->close();
+            QByteArray change = commitMessageFile.readAll();
+            commitMessageFile.close();
             QString errorMessage;
             if (!checkP4Configuration(&errorMessage)) {
                 VCSBase::VCSBaseOutputWindow::instance()->appendError(errorMessage);
@@ -1074,7 +1078,7 @@ bool PerforcePlugin::editorAboutToClose(Core::IEditor *editor)
             }
             QApplication::restoreOverrideCursor();
         }
-        cleanChangeTmpFile();
+        cleanCommitMessageFile();
     }
     return true;
 }