fixed various caching issues when rapidly changing values

app/node/block/block.cpp

@@ -109,7 +109,7 @@ void Block::EdgeAddedSlot(NodeEdgePtr edge)
     RefreshFollowing();
 
     // Entire track will have shifted, so the whole cache needs to be re-validated
-    InvalidateCache(0, RATIONAL_MAX);
+    SendInvalidateCache(0, RATIONAL_MAX);
   }
 }
 
@@ -182,7 +182,7 @@ void Block::set_media_in(const rational &media_in)
     media_in_ = media_in;
 
     // Signal that this clips contents have changed
-    InvalidateCache(in(), out());
+    SendInvalidateCache(in(), out());
   }
 }
 

app/node/block/clip/clip.cpp

@@ -69,11 +69,9 @@ NodeInput *ClipBlock::texture_input()
 
 QVariant ClipBlock::Value(NodeOutput* param, const rational& time)
 {
-  QVariant value = Block::Value(param, time);
-
   if (param == texture_output()) {
     // If the time retrieved is within this block, get texture information
-    if (time >= in() && time < out()) {
+    if (texture_input()->IsConnected() && time >= in() && time < out()) {
       // We convert the time given (timeline time) to media time
       rational media_time = SequenceToMediaTime(time);