Added momentary randomize() disable on ParamWidget

include/app.hpp

@@ -168,6 +168,10 @@ struct Light : TransparentWidget {
 struct ParamWidget : OpaqueWidget, QuantityWidget {
 	Module *module = NULL;
 	int paramId;
+	/** Used to momentarily disable value randomization
+	To permanently disable or change randomization behavior, override the randomize() method instead of changing this.
+	*/
+	bool randomizable = true;
 
 	json_t *toJson();
 	void fromJson(json_t *rootJ);

src/app/Knob.cpp

@@ -12,6 +12,7 @@ namespace rack {
 
 void Knob::onDragStart() {
 	guiCursorLock();
+	randomizable = false;
 }
 
 void Knob::onDragMove(Vec mouseRel) {
@@ -23,6 +24,7 @@ void Knob::onDragMove(Vec mouseRel) {
 
 void Knob::onDragEnd() {
 	guiCursorUnlock();
+	randomizable = true;
 }
 
 void Knob::onChange() {

src/app/ParamWidget.cpp

@@ -15,7 +15,8 @@ void ParamWidget::fromJson(json_t *rootJ) {
 }
 
 void ParamWidget::randomize() {
-	setValue(rescalef(randomf(), 0.0, 1.0, minValue, maxValue));
+	if (randomizable)
+		setValue(rescalef(randomf(), 0.0, 1.0, minValue, maxValue));
 }
 
 void ParamWidget::onMouseDownOpaque(int button) {