2024-04-29

[Problem]

When you start slideshow.php with 'Empty Cache and Hard Reload'
slide-001.jpg exposes call stack in the Network tab, like shown below:
-------------------------------------------------
Image (async)		
(anonymous)	@	VM607:40
setTimeout (async)		
onPreload	@	VM607:39
(anonymous)	@	VM607:168
insertSlide	@	VM607:167
(anonymous)	@	VM607:237
(anonymous)	@	VM607:247
-------------------------------------------------

The cause of this problem hasn't been found out.
A temporal solution is set the time interval of setTimtout
30 or above. ( I set it 500 for sure )

	-------------------------------------------------
	function onPreload(src,callback){
		const img=new Image();
		img.addEventListener("load",function(e){
			if(callback){callback(e);}
		});
		setTimeout(function(){
			img.src=src;
		},500); <==============================================
	};
	-------------------------------------------------