audiovisualwaveform: detect if the start index exceeds the buffer sample count

Fixes segfault.

app/audio/audiovisualwaveform.cpp

@@ -243,6 +243,11 @@ void AudioVisualWaveform::DrawSample(QPainter *painter, const QVector<SamplePerC
 void AudioVisualWaveform::DrawWaveform(QPainter *painter, const QRect& rect, const double& scale, const AudioVisualWaveform &samples, const rational& start_time)
 {
   int start_sample_index = samples.time_to_samples(start_time);
+
+  if (start_sample_index >= samples.nb_samples()) {
+    return;
+  }
+
   int next_sample_index = start_sample_index;
   int sample_index;
 

app/render/ShaderInfo.h

@@ -0,0 +1,4 @@
+#ifndef SHADERINFO_H
+#define SHADERINFO_H
+
+#endif // SHADERINFO_H

app/render/backend/opengl/openglshadercache.h

@@ -1,34 +0,0 @@
-/***
-
-  Olive - Non-Linear Video Editor
-  Copyright (C) 2019 Olive Team
-
-  This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-***/
-
-#ifndef OPENGLSHADERCACHE_H
-#define OPENGLSHADERCACHE_H
-
-#include <QString>
-
-#include "openglshader.h"
-
-OLIVE_NAMESPACE_ENTER
-
-using OpenGLShaderCache = QHash<QString, OpenGLShaderPtr>;
-
-OLIVE_NAMESPACE_EXIT
-
-#endif // OPENGLSHADERCACHE_H