Persist timeline range when loading log file

src/hub/SelectionImpl.ts

@@ -343,7 +343,12 @@ export default class SelectionImpl implements Selection {
   /** Returns the visible range for the timeline. */
   getTimelineRange(): [number, number] {
     this.applyTimelineScroll(0, 0, 0);
-    return this.timelineRange;
+    return [...this.timelineRange];
+  }
+
+  /** Returns whether the timeline is locked to max zoom. */
+  getTimelineIsMaxZoom(): boolean {
+    return this.timelineMaxZoom;
   }
 
   /** Set the visible range for the timeline. */

src/hub/hub.ts

@@ -285,9 +285,13 @@ window.getLoadingFields = () => {
 /** Connects to a historical data source. */
 function startHistorical(path: string, clear = true, merge = false) {
   clear = clear || !merge;
+  let originalTimelineRange: null | [number, number] = null;
+  let originalTimelineIsMaxZoom: null | boolean = null;
   if (clear) {
     historicalSources.forEach((entry) => entry.source.stop());
     historicalSources = [];
+    originalTimelineRange = window.selection.getTimelineRange();
+    originalTimelineIsMaxZoom = window.selection.getTimelineIsMaxZoom();
     window.log = new Log();
     window.sidebar.refresh();
     window.tabs.refresh();
@@ -348,6 +352,11 @@ function startHistorical(path: string, clear = true, merge = false) {
           setWindowTitle(logFriendlyName);
           sourceEntry.progress = null;
           updateLoading();
+          if (originalTimelineRange !== null && originalTimelineIsMaxZoom !== null) {
+            window.selection.setTimelineRange(originalTimelineRange, originalTimelineIsMaxZoom);
+            originalTimelineRange = null;
+            originalTimelineIsMaxZoom = null;
+          }
           break;
         case HistoricalDataSourceStatus.Error:
           setWindowTitle(logFriendlyName, "Error");

src/satellite.ts

@@ -332,6 +332,10 @@ class MockSelection implements Selection {
     throw new Error("Method not implemented.");
   }
 
+  getTimelineIsMaxZoom(): boolean {
+    throw new Error("Method not implemented.");
+  }
+
   setTimelineRange(range: [number, number], lockMaxZoom: boolean) {
     throw new Error("Method not implemented.");
   }

src/shared/Selection.ts

@@ -68,6 +68,9 @@ export default interface Selection {
   /** Returns the visible range for the timeline. */
   getTimelineRange(): [number, number];
 
+  /** Returns whether the timeline is locked to max zoom. */
+  getTimelineIsMaxZoom(): boolean;
+
   /** Set the visible range for the timeline. */
   setTimelineRange(range: [number, number], lockMaxZoom: boolean): void;