autoscroll: don't log same debug message multiple times (#104)

Author: ikreymer

src/autoscroll.ts

@@ -12,6 +12,7 @@ export class AutoScroll extends Behavior {
   samePosCount: number;
 
   origPath: string;
+  lastMsg = "";
 
   constructor(autofetcher: AutoFetcher) {
     super();
@@ -37,6 +38,14 @@ export class AutoScroll extends Behavior {
     return this.currScrollPos() < Math.max(scrollElem.clientHeight, scrollElem.scrollHeight);
   }
 
+  debug(msg: string) {
+    if (this.lastMsg === msg) {
+      return;
+    }
+    super.debug(msg);
+    this.lastMsg = msg;
+  }
+
   hasScrollEL(obj) {
     try {
       return !!self["getEventListeners"](obj).scroll;