Auto load history for activecode problems on page load

Remove "Load History" button completely
Load historyscrubber on activecode problem initialization

Author: ascholerChemeketa

runestone/activecode/js/activecode.js

@@ -288,7 +288,7 @@ export class ActiveCode extends RunestoneBase {
             this.addDownloadButton(ctrlDiv);
         }
         if (!this.hidecode && !this.hidehistory) {
-            this.addHistoryButton(ctrlDiv);
+            this.addHistoryScrubber(true);
         }
         if ($(this.origElem).data("gradebutton") && !this.graderactive) {
             this.addFeedbackButton(ctrlDiv);
@@ -337,19 +337,6 @@ export class ActiveCode extends RunestoneBase {
         $(butt).click(this.createGradeSummary.bind(this));
     }
 
-    addHistoryButton(ctrlDiv) {
-        let butt = document.createElement("button");
-        $(butt).text($.i18n("msg_activecode_load_history"));
-        $(butt).addClass("btn btn-default");
-        $(butt).attr("type", "button");
-        ctrlDiv.appendChild(butt);
-        this.histButton = butt;
-        $(butt).click(this.addHistoryScrubber.bind(this));
-        if (this.graderactive) {
-            this.addHistoryScrubber(true);
-        }
-    }
-
     addDownloadButton(ctrlDiv) {
         let butt = document.createElement("button");
         $(butt).text("Download");
@@ -687,8 +674,6 @@ export class ActiveCode extends RunestoneBase {
         let outOf = this.history.length;
         let ts = this.timestamps[$(scrubber).slider("value")];
         $(this.timestampP).text(`${ts} - ${pos + 1} of ${outOf}`);
-        $(this.histButton).remove();
-        this.histButton = null;
         this.historyScrubber = scrubber;
         $(scrubberDiv).insertAfter(this.runButton);
     } // end definition of helper

runestone/activecode/js/timed_activecode.js

@@ -78,7 +78,6 @@ var TimedActiveCodeMixin = {
         this.runButton.disabled = false;
         $(this.codeDiv).removeClass("ac-disabled");
         this.editor.refresh();
-        $(this.histButton).click(this.addHistoryScrubber.bind(this));
         if (this.historyScrubber !== null) {
             $(this.historyScrubber).slider({
                 max: this.history.length - 1,