Fix turbo stream link setting the src of a turbo frame container

src/observers/form_link_click_observer.ts

@@ -26,7 +26,7 @@ export class FormLinkClickObserver implements LinkClickObserverDelegate {
   willFollowLinkToLocation(link: Element, location: URL, originalEvent: MouseEvent): boolean {
     return (
       this.delegate.willSubmitFormLinkToLocation(link, location, originalEvent) &&
-      link.hasAttribute("data-turbo-method")
+      link.hasAttribute("data-turbo-method") && link.hasAttribute("data-turbo-stream")
     )
   }
 

src/tests/functional/frame_tests.ts

@@ -90,6 +90,19 @@ test("test following a link sets the frame element's [src]", async ({ page }) =>
   assert.equal(src.searchParams.get("key"), "value", "[src] attribute encodes query parameters")
 })
 
+test("test following a link doesn't set the frame element's [src] if the link has [data-turbo-stream]", async ({ page }) => {
+  await page.goto("/src/tests/fixtures/form.html")
+
+  const originalSrc = await page.getAttribute("#frame", "src");
+
+  await page.click("#stream-link-get-method-inside-frame");
+  await nextBeat()
+
+  const newSrc = await page.getAttribute("#frame", "src");
+
+  assert.equal(originalSrc, newSrc, "the turbo-frame src should not change after clicking the link");
+})
+
 test("test a frame whose src references itself does not infinitely loop", async ({ page }) => {
   await page.click("#frame-self")