[LyX/master] Fix compilation with 5 <= qt < 5.4

[Guillaume Munch]

commit 797bb2df147d6b5ac3ad1d5ca612657421ccb258
Author: Guillaume Munch <g...@lyx.org>
Date:   Sat Mar 11 22:21:11 2017 +0100

    Fix compilation with 5 <= qt < 5.4
---
 src/support/FileMonitor.cpp |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/support/FileMonitor.cpp b/src/support/FileMonitor.cpp
index 051bbbb..bf53f37 100644
--- a/src/support/FileMonitor.cpp
+++ b/src/support/FileMonitor.cpp
@@ -106,19 +106,13 @@ void FileMonitorGuard::refresh(bool new_file)
                bool exists = QFile(qfilename).exists();
 #if (QT_VERSION >= 0x050000)
                if (!exists || !qwatcher_->addPath(qfilename)) {
-                       if (exists)
-                               LYXERR(Debug::FILES,
-                                      "Could not add path to 
QFileSystemWatcher: "
-                                      << filename_);
-                       QTimer::singleShot(1000, this, [=](){
-                                       refresh(new_file || !exists);
-                               });
 #else
                auto add_path = [&]() {
                        qwatcher_->addPath(qfilename);
                        return qwatcher_->files().contains(qfilename);
                };
                if (!exists || !add_path()) {
+#endif
                        if (exists)
                                LYXERR(Debug::FILES,
                                       "Could not add path to 
QFileSystemWatcher: "
@@ -127,7 +121,10 @@ void FileMonitorGuard::refresh(bool new_file)
                                QTimer::singleShot(1000, this, 
SLOT(refreshTrue()));
                        else
                                QTimer::singleShot(1000, this, 
SLOT(refreshFalse()));
-#endif
+                       // Better (qt>=5.4):
+                       /*QTimer::singleShot(1000, this, [=](){
+                                       refresh(new_file || !exists);
+                               });*/
                } else if (exists && new_file)
                        Q_EMIT fileChanged();
        }