Suspend everything *after* the current selection

The first selection will be the root. We can't show anything suspended for
that. The next one should be one step after that.

This lets you see the final state by going to the end of the timeline.

Author: sebmarkbage

packages/react-devtools-shared/src/devtools/views/SuspenseTab/SuspenseTimeline.js

@@ -184,7 +184,11 @@ function SuspenseTimelineInput() {
       );
       return;
     }
-    const suspendedSet = timeline.slice(timelineIndex);
+    // We suspend everything after the current selection. The root isn't showing
+    // anything suspended in the root. The step after that should have one less
+    // thing suspended. I.e. the first suspense boundary should be unsuspended
+    // when it's selected. This also lets you show everything in the last step.
+    const suspendedSet = timeline.slice(timelineIndex + 1);
     bridge.send('overrideSuspenseMilestone', {
       rendererID,
       rootID,