Insert tabs for \t when doing regexp replace.

Task-number: QTCREATORBUG-1544

src/libs/utils/filesearch.cpp

@@ -295,6 +295,7 @@ QFuture<FileSearchResultList> Utils::findInFilesRegExp(const QString &searchTerm
 
 QString Utils::expandRegExpReplacement(const QString &replaceText, const QStringList &capturedTexts)
 {
+    // handles \1 \\ \& & \t
     QString result;
     int numCaptures = capturedTexts.size() - 1;
     for (int i = 0; i < replaceText.length(); ++i) {
@@ -305,6 +306,8 @@ QString Utils::expandRegExpReplacement(const QString &replaceText, const QString
                 result += QLatin1Char('\\');
             } else if (c == QLatin1Char('&')) {
                 result += QLatin1Char('&');
+            } else if (c == QLatin1Char('t')) {
+                result += QLatin1Char('\t');
             } else if (c.isDigit()) {
                 int index = c.unicode()-'1';
                 if (index < numCaptures) {