Generate cover image (#376)

* Make mutating metadata ops mutation
* Implement scene generate screenshot
* Remove fetch policy on metadata mutations
* Port UI changes to v2.5
* Set generated image in database

ui/v2.5/src/components/Scenes/SceneDetails/SceneOperationsPanel.tsx

@@ -0,0 +1,36 @@
+import { Button } from "react-bootstrap";
+import React, { FunctionComponent } from "react";
+import * as GQL from "src/core/generated-graphql";
+import { StashService } from "src/core/StashService";
+import { useToast } from "src/hooks";
+import { JWUtils } from "src/utils";
+
+interface IOperationsPanelProps {
+  scene: GQL.SceneDataFragment;
+}
+
+export const SceneOperationsPanel: FunctionComponent<IOperationsPanelProps> = (props: IOperationsPanelProps) => {
+  const Toast = useToast();
+  const [generateScreenshot] = StashService.useSceneGenerateScreenshot();
+
+  async function onGenerateScreenshot(at?: number) {
+    await generateScreenshot({
+      variables: {
+        id: props.scene.id,
+        at: at
+      }
+    });
+    Toast.success({ content: "Generating screenshot" });
+  }
+
+  return (
+    <>
+      <Button className="edit-button" onClick={() => onGenerateScreenshot(JWUtils.getPlayer().getPosition())}>
+        Generate thumbnail from current
+      </Button>
+      <Button className="edit-button" onClick={() => onGenerateScreenshot()}>
+        Generate default thumbnail
+      </Button>
+    </>
+  );
+};