fix: bug-fix sweep across node, audio, render, plugin subsystems

Node core:
- MathNode/TrigonometryNode combo strings realigned with Operation enums
- mathbase scalar/vector operand pick no longer uses bitwise type checks
- NodeSetPositionAndDependenciesRecursively moves dependencies again
- RemoveAllKeyframes undo actually restores keyframes
- NodeGroup GetInputName null-deref guard, passthrough ids use input id
- NodeValueTable::Has is an exact type match; tag fallback only for
  empty tags; kStrCombo/kPushButton get data type names
- delete_all_keyframes no longer loops forever on unparented keyframes;
  keyframe-load failures propagate; rational interpolation falls back to
  double; OpacityEffect no longer leaks its internal MathNode

Audio/footage:
- AudioVisualWaveform: GetSummaryFromTime underflow OOB read, TrimIn
  prepend length bookkeeping, OverwriteSums source channel indexing
- PanNode inserts the pan value into the sample job (keyframed pan
  works); OutputParamsChanged is emitted on device change; PortAudio
  device indices are validated before Pa_GetDeviceInfo
- Footage: AdjustTimeByLoopMode no longer hangs/UBs on degenerate
  lengths, GetStreamIndex bounds-checked, CheckFootage clears stale
  state on missing files, failed probes are not cached,
  FootageDescription::Load requires its own root element

Render/track:
- ViewerOutput pushes the tagged samples value; TrackList disconnects
  the track-height lambda; GetTrackFromReference validity check
- RenderManager dummy backend: null-initialized threads, guarded
  decoder-cache/timer paths; Renderer::Destroy releases color cache
  shaders/textures; unknown dynamic backends no longer alias to oakgl
- SharedMemoryRegion POSIX attach validates segment size; ReadMessage
  skips blank lines instead of failing; GC counter clamped;
  IsRenderingCustomRange implemented; TimeOffsetNode gets a true
  inverse OutputTimeAdjustment; zero-speed clips return the held frame

Plugin/nodes:
- OliveClip: stored default region of definition is honored, on-demand
  images are cached; OliveHost sets host identity properties and logs
  instead of showing modal dialogs offscreen; Plugin.h dead decls gone
- DespillNode guards graph-less use with Rec.709 fallback; description
  typos fixed (despill, swirl); mosaic applies when only one axis
  matches; Windows-only Project filename separator test fixed

app/pluginSupport/OliveClip.cpp

@@ -467,7 +467,14 @@ olive::plugin::OliveClipInstance::getImage(OfxTime time,
 			return nullptr;
 		}
 
+		// Cache the on-demand image like the output path does, so repeated
+		// fetches at the same time reuse it and getConnected() reflects it.
+		// The extra reference keeps the cached image alive when the plugin
+		// releases its own.
+		pruneImagesCache();
 		Image *image = new Image(*this, preferred_params, bounds, rod, true);
+		images_.insert(time, image);
+		image->addReference();
 		return image;
 	}
 }
@@ -546,6 +553,11 @@ olive::plugin::OliveClipInstance::getRegionOfDefinition(OfxTime time) const
 	double par = params_.pixel_aspect_ratio().toDouble();
 	regionOfDefinition.x2 = params_.width() * par;
 	regionOfDefinition.y2 = params_.height();
+	if (regionOfDefinition.x2 <= 0 || regionOfDefinition.y2 <= 0) {
+		// The params provide no usable region; fall back to the default set
+		// via setDefaultRegionOfDefinition().
+		return defaultRegionOfDefinitions_;
+	}
 	return regionOfDefinition;
 }
 void olive::plugin::OliveClipInstance::setRegionOfDefinition(

app/pluginSupport/OliveHost.cpp

@@ -33,6 +33,7 @@
 #include "OlivePluginInstance.h"
 #include "common/Current.h"
 #include "ofxMessage.h"
+#include "version.h"
 #include <QMessageBox>
 using namespace OFX::Host;
 using namespace olive::plugin;
@@ -113,6 +114,26 @@ void olive::plugin::loadPlugins(QString path)
 	}
 	cache->scanPluginFiles();
 }
+OliveHost::OliveHost()
+{
+	// Identify the host to plugins; HostSupport seeds these with "UNKNOWN".
+	_properties.setStringProperty(kOfxPropName, "Oak Video Editor");
+	_properties.setStringProperty(kOfxPropLabel, "Oak Video Editor");
+	_properties.setStringProperty(kOfxPropVersionLabel,
+								  olive::kAppVersion.toStdString());
+
+	// Numeric version for plugins that query kOfxPropVersion directly.
+	const QStringList version_parts =
+		olive::kAppVersion.section(QLatin1Char('-'), 0, 0)
+			.split(QLatin1Char('.'));
+	_properties.setIntProperty(kOfxPropVersion,
+							   version_parts.value(0).toInt(), 0);
+	_properties.setIntProperty(kOfxPropVersion,
+							   version_parts.value(1).toInt(), 1);
+	_properties.setIntProperty(kOfxPropVersion,
+							   version_parts.value(2).toInt(), 2);
+}
+
 OliveHost::~OliveHost()
 {
 }
@@ -184,7 +205,9 @@ OfxStatus olive::plugin::OliveHost::vmessage(const char *type, const char *id,
 	QString message(buffer);
 
 	auto *app = qobject_cast<QApplication *>(QCoreApplication::instance());
-	if (!app) {
+	// A modal dialog would hang a headless (offscreen) session, so log to
+	// stderr instead of showing one.
+	if (!app || QGuiApplication::platformName() == QLatin1String("offscreen")) {
 		qWarning().noquote() << "OFX message:" << type << message;
 		if (strcmp(type, kOfxMessageQuestion) == 0) {
 			return kOfxStatReplyNo;
@@ -223,15 +246,32 @@ OfxStatus olive::plugin::OliveHost::setPersistentMessage(const char *type,
 	vsnprintf(buffer, sizeof(buffer), format, args);
 	QString message(buffer);
 
+	// A modal dialog would hang a headless (offscreen) session, so log to
+	// stderr instead of showing one.
+	const bool headless =
+		QGuiApplication::platformName() == QLatin1String("offscreen");
+
 	if (strcmp(type, kOfxMessageError) == 0) {
 		persistent_messages_.append({ HostMessageType::Error, message });
-		QMessageBox::critical(nullptr, "", message);
+		if (headless) {
+			qWarning().noquote() << "OFX error:" << message;
+		} else {
+			QMessageBox::critical(nullptr, "", message);
+		}
 	} else if (strcmp(type, kOfxMessageWarning) == 0) {
 		persistent_messages_.append({ HostMessageType::Warning, message });
-		QMessageBox::warning(nullptr, "", message);
+		if (headless) {
+			qWarning().noquote() << "OFX warning:" << message;
+		} else {
+			QMessageBox::warning(nullptr, "", message);
+		}
 	} else if (strcmp(type, kOfxMessageMessage) == 0) {
 		persistent_messages_.append({ HostMessageType::Message, message });
-		QMessageBox::information(nullptr, "", message);
+		if (headless) {
+			qWarning().noquote() << "OFX message:" << message;
+		} else {
+			QMessageBox::information(nullptr, "", message);
+		}
 	} else {
 		return kOfxStatFailed;
 	}

app/pluginSupport/OliveHost.h

@@ -44,7 +44,7 @@ struct HostPersistentMessage {
 void loadPlugins(QString path);
 class OliveHost : public OFX::Host::ImageEffect::Host {
 public:
-	OliveHost() = default;
+	OliveHost();
 	~OliveHost() override;
 	void destroyInstance(OFX::Host::ImageEffect::Instance *instance);