Allow capture retries if time since Rescan() < 10s

The time since Rescan() of recording device is the important factor,
not the "newness" of the project.

src/AudioIO.cpp

@@ -408,7 +408,7 @@ TimeTrack and AudioIOListener and whether the playback is looped.
 #include "Experimental.h"
 #include "AudioIO.h"
 #include "float_cast.h"
-#include "UndoManager.h"
+#include "DeviceManager.h"
 
 #include <cfloat>
 #include <math.h>
@@ -1780,11 +1780,12 @@ bool AudioIO::StartPortAudioStream(double sampleRate,
    int  userData = 24;
    int* lpUserData = (captureFormat_saved == int24Sample) ? &userData : NULL;
 
-   // (Linux, bug 1885) On first use, the device may not be ready in time, so allow retries.
+   // (Linux, bug 1885) After scanning devices it takes a little time for the
+   // ALSA device to be available, so allow retries.
    // On my test machine, no more than 3 attempts are required.
    unsigned int maxTries = 1;
 #ifdef __WXGTK__
-   if (!mOwningProject->GetUndoManager()->UnsavedChanges())
+   if (DeviceManager::Instance()->GetTimeSinceRescan() < 10)
       maxTries = 5;
 #endif
 

src/DeviceManager.cpp

@@ -306,8 +306,17 @@ void DeviceManager::Rescan()
       }
    }
    m_inited = true;
+   mRescanTime = std::chrono::steady_clock::now();
 }
 
+
+float DeviceManager::GetTimeSinceRescan() {
+   auto now = std::chrono::steady_clock::now();
+   auto dur = std::chrono::duration_cast<std::chrono::duration<float>>(now - mRescanTime);
+   return dur.count();
+}
+
+
 //private constructor - Singleton.
 DeviceManager::DeviceManager()
 #if defined(EXPERIMENTAL_DEVICE_CHANGE_HANDLER)
@@ -317,6 +326,7 @@ DeviceManager::DeviceManager()
 #endif
 {
    m_inited = false;
+   mRescanTime = std::chrono::steady_clock::now();
 }
 
 DeviceManager::~DeviceManager()

src/DeviceManager.h

@@ -20,6 +20,7 @@
 
 #include "Experimental.h"
 
+#include <chrono>
 #include <vector>
 #include "wx/wx.h"
 
@@ -55,6 +56,9 @@ class DeviceManager final
    /// Assumes that DeviceManager is only used on the main thread.
    void Rescan();
 
+   // Time since devices scanned in seconds.
+   float GetTimeSinceRescan();
+
    DeviceSourceMap* GetDefaultOutputDevice(int hostIndex);
    DeviceSourceMap* GetDefaultInputDevice(int hostIndex);
 
@@ -68,6 +72,9 @@ class DeviceManager final
 #endif
 #endif
 
+private:
+   std::chrono::time_point<std::chrono::steady_clock> mRescanTime;
+
  protected:
    //private constructor - Singleton.
    DeviceManager();