fix: Send's balance line is drawn again when a refresh returns (closes #748)

Send opened at an address no refresh had read kept reading
"Current balance: unknown" after a refresh had read the balance, until the
screen was opened again. A token just added read the same way.

A refresh that returns while Send is up now runs updateSendBalance(). The
token list is not rebuilt, so the recipient, amount and token stay as the
user left them. README says so.

Model: opus-5-5

tests/addedTokenBalance.test.js

@@ -19,12 +19,17 @@
 // its ETH line reads the same, and Send states it as unknown
 // (https://git.eeqj.de/sneak/AutistMask/issues/736).
 //
+// A refresh that returns while Send is up draws Send's balance line again, and
+// leaves what the user entered as it is
+// (https://git.eeqj.de/sneak/AutistMask/issues/748).
+//
 // Driven through the real popup over a stored profile on Ethereum Mainnet,
 // with "Show tracked tokens with zero balance" on, as it is by default.
 
 const { HDNodeWallet, Mnemonic } = require("ethers");
 
 const {
+    ADDRESS,
     bootPopup,
     cleanupPopup,
     unversionedValidProfile,
@@ -431,6 +436,62 @@ test("Send for the new token reads its balance as unknown before any refresh has
     await finish([MILLION]);
 });
 
+test("Send for the new token reads the fetched balance once the refresh returns, without being reopened", async () => {
+    const page = await bootOnAddress();
+    const finish = holdNextRefresh(page);
+    await addNewToken(page);
+    await openToken(page, NEW_TOKEN.toLowerCase());
+    await page.click("btn-address-token-send");
+    expect(page.text("send-balance")).toBe("Current balance: unknown (NEW)");
+
+    await finish([MILLION]);
+
+    expect(page.visibleViews()).toEqual(["send"]);
+    expect(page.text("send-balance")).toBe("Current balance: 1000000.0000 NEW");
+});
+
+test("a refresh that returns while Send is up draws an unread ETH balance again and leaves the inputs alone", async () => {
+    const page = await bootPopup(profileNotRead());
+    // The dropdown's first option, which a browser selects by itself.
+    page.node("send-token").value = "ETH";
+    await page.click("btn-main-send");
+    expect(page.text("send-balance")).toBe("Current balance: unknown (ETH)");
+    const recipient = "0x" + "dd".repeat(20);
+    page.node("send-to").value = recipient;
+    page.node("send-amount").value = "0.5";
+    // Stands for the options on the screen, which a refresh leaves as they are.
+    page.node("send-token").innerHTML = "options on the screen";
+    // Stands for the From address from before the refresh.
+    page.node("send-from").innerHTML = "From address before the refresh";
+
+    await refreshOnce(page, []);
+
+    expect(page.visibleViews()).toEqual(["send"]);
+    expect(page.text("send-balance")).toBe("Current balance: 2.0000 ETH");
+    expect(page.node("send-from").innerHTML).toContain(ADDRESS);
+    expect(page.value("send-to")).toBe(recipient);
+    expect(page.value("send-amount")).toBe("0.5");
+    expect(page.value("send-token")).toBe("ETH");
+    expect(page.node("send-token").innerHTML).toBe("options on the screen");
+});
+
+test("a refresh that returns while Send is up keeps the token picked in the dropdown and draws its new balance", async () => {
+    const page = await bootOnDerivingWallet();
+    const dropdown = page.node("send-token");
+    dropdown.value = "ETH";
+    await page.click("btn-main-send");
+    dropdown.value = NEW_TOKEN;
+    for (const fn of dropdown.listeners.change) await fn();
+    expect(page.text("send-balance")).toBe("Current balance: 1000000.0000 NEW");
+    page.node("send-amount").value = "0.5";
+
+    await refreshOnce(page, [{ ...MILLION, balance: "3000000.0" }]);
+
+    expect(page.text("send-balance")).toBe("Current balance: 3000000.0000 NEW");
+    expect(page.value("send-token")).toBe(NEW_TOKEN);
+    expect(page.value("send-amount")).toBe("0.5");
+});
+
 test("a token added by contract address on SettingsAddToken reads quantity unknown until the refresh returns", async () => {
     const page = await bootPopup(unversionedValidProfile());
     expect(page.visibleViews()).toEqual(["main"]);