fix a few krazy warnings

src/plugins/debugger/pdb/pdbengine.cpp

@@ -120,7 +120,7 @@ void PdbEngine::postDirectCommand(const QByteArray &command)
 {
     QTC_ASSERT(m_pdbProc.state() == QProcess::Running, notifyEngineIll());
     showMessage(_(command), LogInput);
-    m_pdbProc.write(command + "\n");
+    m_pdbProc.write(command + '\n');
 }
 
 void PdbEngine::postCommand(const QByteArray &command,
@@ -138,7 +138,7 @@ void PdbEngine::postCommand(const QByteArray &command,
     m_commands.enqueue(cmd);
     qDebug() << "ENQUEUE: " << command << cmd.callbackName;
     showMessage(_(cmd.command), LogInput);
-    m_pdbProc.write(cmd.command + "\n");
+    m_pdbProc.write(cmd.command + '\n');
 }
 
 void PdbEngine::shutdownInferior()

src/plugins/fakevim/fakevimhandler.cpp

@@ -2774,7 +2774,7 @@ EventResult FakeVimHandler::Private::handleInsertMode(const Input &input)
     } else if (input.isReturn()) {
         m_submode = NoSubMode;
         insertText(Register("\n"));
-        m_lastInsertion += "\n";
+        m_lastInsertion += '\n';
         insertAutomaticIndentation(true);
         setTargetColumn();
     } else if (input.isBackspace()) {
@@ -2974,7 +2974,7 @@ EventResult FakeVimHandler::Private::handleSearchSubSubMode(const Input &input)
                 sd.highlightMatches = true;
                 search(sd);
             }
-            finishMovement(m_commandPrefix + needle + "\n");
+            finishMovement(m_commandPrefix + needle + '\n');
         }
         enterCommandMode();
         highlightMatches(needle);
@@ -4613,7 +4613,7 @@ void FakeVimHandler::Private::enterExMode()
     m_mode = ExMode;
     m_submode = NoSubMode;
     m_subsubmode = NoSubSubMode;
-    m_commandPrefix = ":";
+    m_commandPrefix = ':';
 }
 
 void FakeVimHandler::Private::recordJump()

src/plugins/macros/macromanager.cpp

@@ -151,7 +151,7 @@ void MacroManager::MacroManagerPrivate::initialize()
     QStringList files = dir.entryList(filter, QDir::Files);
 
     foreach (const QString &name, files) {
-        QString fileName = dir.absolutePath()+"/"+name;
+        QString fileName = dir.absolutePath() + '/' + name;
         Macro *macro = new Macro;
         macro->loadHeader(fileName);
         addMacro(macro);