Allow reporting of drop-outs to be turned off by Recording prefs...

... Just in case it turns out to make some false positives.

src/AudioIO.cpp

@@ -1867,6 +1867,7 @@ int AudioIO::StartStream(const WaveTrackConstArray &playbackTracks,
 {
    mLostSamples = 0;
    mLostCaptureIntervals.clear();
+   mDetectDropouts = gPrefs->Read(wxT("/AudioIO/DetectDropouts"), true);
    auto cleanup = finally ( [this] { ClearRecordingException(); } );
 
    if( IsBusy() )
@@ -5171,7 +5172,8 @@ int audacityAudioCallback(const void *inputBuffer, void *outputBuffer,
          // the other thread, executing FillBuffers, isn't consuming fast
          // enough from mCaptureBuffers; maybe it's CPU-bound, or maybe the
          // storage device it writes is too slow
-         if (inputError || len < framesPerBuffer) {
+         if (gAudioIO->mDetectDropouts &&
+             (inputError || len < framesPerBuffer) ) {
             // Assume that any good partial buffer should be written leftmost
             // and zeroes will be padded after; label the zeroes.
             auto start = gAudioIO->mTime;

src/AudioIO.h

@@ -798,6 +798,7 @@ private:
       { if (mRecordingException) wxAtomicDec( mRecordingException ); }
 
    std::vector< std::pair<double, double> > mLostCaptureIntervals;
+   bool mDetectDropouts{ true };
 
 public:
    const std::vector< std::pair<double, double> > &LostCaptureIntervals()

src/prefs/RecordingPrefs.cpp

@@ -166,6 +166,9 @@ void RecordingPrefs::PopulateOrExchange(ShuttleGui & S)
        S.TieCheckBox(_("Always record on a new track"),
                     wxT("/GUI/PreferNewTrackRecord"),
                     false);
+       S.TieCheckBox(_("Detect dropouts"),
+                     wxT("/AudioIO/DetectDropouts"),
+                     true);
    }
    S.EndStatic();