Make -2 the magic infinite loops value

src/dialogxml/widgets/pict.cpp

@@ -935,6 +935,12 @@ void cPict::drawPresetField(short num, rectangle to_rect){
 	rect_draw_some_item(*from_gw, from_rect, getWindow(), to_rect, sf::BlendAlpha);
 }
 
+void cPict::setAnimLoops(short value) {
+	// -2 is infinite loops. Anything else <= 0 is no animation.
+	if(value >= 0 || value == -2) animLoops = value;
+	else animLoops = 0;
+}
+
 void cPict::updateAnim(short loop_frames) {
 	if(prevAnimFrame != animFrame){
 		if(animFrame % loop_frames == 0 && animLoops > 0)

src/dialogxml/widgets/pict.hpp

@@ -85,7 +85,7 @@ public:
 	cPict& operator=(cPict& other) = delete;
 	cPict(cPict& other) = delete;
 	inline static void resetAnim() { animFrame = 0; }
-	inline void setAnimLoops(short value) { animLoops = value; }
+	void setAnimLoops(short value);
 private:
 	static std::shared_ptr<const sf::Texture> getSheetInternal(eSheetType type, size_t n);
 	std::shared_ptr<const sf::Texture> getSheet(eSheetType type, size_t n = 0);