Add sub-queries to the JS profiler table

front/src/css/timeline.css

@@ -177,6 +177,46 @@ input.textFilter {
 .table > div > .type {
   white-space: nowrap;
 }
+.table .children {
+  margin-top: 0.2em;
+  font-size: 0.8em;
+  line-height: 1.6em;
+}
+.table .child {
+  margin-left: 0.5em;
+}
+.table .child > .child {
+  margin-left: 1em;
+}
+.table .child:before {
+  content: "↳";
+}
+.table .child .childArgs {
+  display: none;
+}
+.table .child span {
+  position: relative;
+}
+.table .child span:hover {
+  background: #EBD8E2;
+}
+.table .child span:hover .childArgs {
+  display: block;
+  position: absolute;
+  padding: 0 1em 0 2em;
+  left: 100%;
+  top: 0;
+  background: #EBD8E2;
+  line-height: 1.3em;
+  height: 1.3em;
+  z-index: 1;
+}
+.table .showingDetails .child span:hover {
+  background: inherit;
+}
+.table .showingDetails .child span:hover .childArgs {
+  display: none;
+}
 .table > div > .value {
   width: 70%;
   word-break: break-all;