fix: match SDK capture frames across demangler renderings

.sampo/changesets/demangler-robust-frame-strip.md

@@ -0,0 +1,5 @@
+---
+cargo/posthog-rs: patch
+---
+
+fix: strip SDK capture frames under newer demangler renderings (`<Type>::method::<T>`), which previously survived at the crash-site end of the stack

src/error_tracking.rs

@@ -1176,6 +1176,11 @@ fn is_panic_dispatcher_frame(function: &str) -> bool {
 // the strip loop stops at them and they survive, classified out-of-app for the
 // UI to collapse.
 fn is_internal_capture_frame(function: &str) -> bool {
+    // Demanglers differ on qualified-path rendering across toolchain versions:
+    // older output is `Exception::from_error`, newer output wraps the type as
+    // `<posthog_rs::error_tracking::Exception>::from_error::<T>`. Strip the
+    // angle brackets before matching so both forms hit.
+    let function: String = function.replace(['<', '>'], "");
     function.starts_with("backtrace::")
         || function.contains("capture_frames_current_first")
         || function.contains("capture_raw_frames")
@@ -1966,6 +1971,24 @@ mod tests {
         );
     }
 
+    #[test]
+    fn internal_capture_frames_match_both_demangler_renderings() {
+        // Older toolchains demangle as `Type::method`, newer ones as
+        // `<path::Type>::method::<T>` — the strip must catch both, or an SDK
+        // frame survives at the crash-site end of the canonical order.
+        for name in [
+            "posthog_rs::error_tracking::Exception::from_error",
+            "<posthog_rs::error_tracking::Exception>::from_error::<posthog_rs::error_tracking::tests::OuterError>",
+            "<posthog_rs::error_tracking::Exception>::from_message",
+            "<posthog_rs::client::Client>::capture_exception::<E>",
+        ] {
+            assert!(is_internal_capture_frame(name), "should strip {name:?}");
+        }
+        assert!(!is_internal_capture_frame(
+            "my_app::checkout::Exception_from_error_report"
+        ));
+    }
+
     #[test]
     fn from_error_builds_exception_list_with_stacktrace() {
         let error = OuterError { source: InnerError };