Merge pull request #115514 from cockroachdb/blathers/backport-release…

…-23.2-115044

release-23.2: ui: keep timewindow with fixed range after Now button click

pkg/ui/workspaces/cluster-ui/src/timeScaleDropdown/timeScaleDropdown.tsx

@@ -183,7 +183,12 @@ export const TimeScaleDropdown: React.FC<TimeScaleDropdownProps> = ({
       case ArrowDirection.CENTER:
         // CENTER is used to set the time window to the current time.
         endTime = now;
-        isMoving = true;
+        // Only predefined time ranges are considered to be moving window (ie Past Hour, Past 3 days, etc).
+        // Custom time window has specific start/end time and constant duration, and in this case we
+        // move time window with the same duration with end time = now() and keep it fixed as before.
+        if (key !== "Custom") {
+          isMoving = true;
+        }
         break;
       default:
         getLogger().error("Unknown direction: ", direction);