nodeinput: added convenience function for determining if a value is expected to change over time

app/node/input.cpp

@@ -970,6 +970,11 @@ bool NodeInput::is_keyframable() const
   return keyframable_;
 }
 
+bool NodeInput::is_static() const
+{
+  return !(this->is_connected() || this->is_keyframing());
+}
+
 QVariant NodeInput::get_standard_value() const
 {
   return combine_track_values_into_normal_value(standard_value_);

app/node/input.h

@@ -200,6 +200,13 @@ public:
    */
   bool is_keyframable() const;
 
+  /**
+   * @brief Returns whether the value that this input returns is always the same or is expected to change
+   *
+   * Equivalent to `!(is_connected() || is_keyframing())`
+   */
+  bool is_static() const;
+
   /**
    * @brief Get non-keyframed value
    */