subset embedding UI improvement (#1667)

* add user flag feature to annomatrix

* add implicit subsetting for partial embeddings

* lint

* add embedding cell counts to embedding choice menu

* layout

client/src/actions/embedding.js

@@ -0,0 +1,33 @@
+/*
+action creators related to embeddings choice
+*/
+
+import { AnnoMatrixObsCrossfilter } from "../annoMatrix";
+import { _setEmbeddingSubset } from "../util/stateManager/viewStackHelpers";
+
+export const layoutChoiceAction = (newLayoutChoice) => async (
+  dispatch,
+  getState
+) => {
+  /*
+  On layout choice, make sure we have selected all on the previous layout, AND the new
+  layout.
+  */
+  const { annoMatrix: prevAnnoMatrix } = getState();
+
+  const embeddingDf = await prevAnnoMatrix.base().fetch("emb", newLayoutChoice);
+  const annoMatrix = _setEmbeddingSubset(prevAnnoMatrix, embeddingDf);
+  const obsCrossfilter = await new AnnoMatrixObsCrossfilter(annoMatrix).select(
+    "emb",
+    newLayoutChoice,
+    {
+      mode: "all",
+    }
+  );
+  dispatch({
+    type: "set layout choice",
+    layoutChoice: newLayoutChoice,
+    obsCrossfilter,
+    annoMatrix,
+  });
+};