Fix bug and warning calculating available mix duration when no frame is available

src/dialogs/renderwidget.h

@@ -227,8 +227,8 @@ private:
     void prepareRendering(bool delayedRendering);
     /** @brief Create a new empty playlist (*.mlt) file and @returns the filename of the created file */
     QString generatePlaylistFile(bool delayedRendering);
-    void generateRenderFiles(QDomDocument doc, int in, int out, QString outputFile, bool delayedRendering);
-    RenderJobItem *createRenderJob(const QString &playlist, const QString &outputFile, int in, int out);
+    void generateRenderFiles(QDomDocument doc, int in, int out, QString outputFile, bool delayedRendering, const QString &subtitleFile = QString());
+    RenderJobItem *createRenderJob(const QString &playlist, const QString &outputFile, int in, int out, const QString &subtitleFile = QString());
 
 signals:
     void abortProcess(const QString &url);

src/timeline2/model/timelinemodel.cpp

@@ -938,9 +938,12 @@ bool TimelineModel::mixClip(int idToMove, const QString &mixId, int delta)
             }
             // Make sure we have enough space in clip to resize
             // leftMax is the maximum frames we have to expand first clip on the right
-            leftMax = m_allClips[s]->getPlaytime();
+            leftMax = m_allClips[previousClip]->m_endlessResize
+                          ? m_allClips[s]->getPlaytime()
+                          : qMin(m_allClips[s]->getPlaytime(), m_allClips[previousClip]->getMaxDuration() - m_allClips[previousClip]->getOut() - 1);
             // rightMax is the maximum frames we have to expand second clip on the left
-            rightMax = m_allClips[previousClip]->getPlaytime();
+            rightMax = m_allClips[s]->m_endlessResize ? m_allClips[previousClip]->getPlaytime()
+                                                      : qMin(m_allClips[previousClip]->getPlaytime(), m_allClips[s]->getIn());
             if (getTrackById_const(selectedTrack)->hasStartMix(previousClip)) {
                 int spaceBeforeMix = m_allClips[s]->getPosition() - (m_allClips[previousClip]->getPosition() + m_allClips[previousClip]->getMixDuration());
                 rightMax = rightMax == -1 ? spaceBeforeMix : qMin(rightMax, spaceBeforeMix);
@@ -965,9 +968,10 @@ bool TimelineModel::mixClip(int idToMove, const QString &mixId, int delta)
             // Mix at end of selected clip
             // Make sure we have enough space in clip to resize
             // leftMax is the maximum frames we have to expand first clip on the right
-            leftMax = m_allClips[nextClip]->getPlaytime();
+            leftMax = m_allClips[s]->m_endlessResize ? m_allClips[nextClip]->getPlaytime()
+                                                     : qMin(m_allClips[nextClip]->getPlaytime(), m_allClips[s]->getMaxDuration() - m_allClips[s]->getOut() - 1);
             // rightMax is the maximum frames we have to expand second clip on the left
-            rightMax = m_allClips[s]->getPlaytime();
+            rightMax = m_allClips[nextClip]->m_endlessResize ? m_allClips[s]->getPlaytime() : qMin(m_allClips[s]->getPlaytime(), m_allClips[nextClip]->getIn());
             if (getTrackById_const(selectedTrack)->hasStartMix(s)) {
                 int spaceBeforeMix = m_allClips[nextClip]->getPosition() - (m_allClips[s]->getPosition() + m_allClips[s]->getMixDuration());
                 rightMax = rightMax == -1 ? spaceBeforeMix : qMin(rightMax, spaceBeforeMix);