Fix should_log_lsp_request_failure logic inversion (#57554)

Was trying to debug an r-a issue and ran into this.

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliabilityx
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes #ISSUE

Release Notes:

- N/A or Added/Fixed/Improved ...

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/project/src/lsp_store.rs

@@ -4225,9 +4225,10 @@ impl SymbolLocation {
 }
 
 fn should_log_lsp_request_failure(message: &str) -> bool {
-    // content modified is a weird failure mode of rust-analyzer
-    // where requests are denied before its loaded a project
-    message.ends_with("content modified") || message.ends_with("server cancelled the request")
+    // "content modified" and "server cancelled the request" are noisy failure
+    // modes of rust-analyzer where requests are denied before it has loaded a
+    // project.
+    !(message.ends_with("content modified") || message.ends_with("server cancelled the request"))
 }
 
 impl LspStore {
@@ -15312,3 +15313,28 @@ fn extend_formatting_transaction(
         Ok(())
     })
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn should_log_lsp_request_failure_suppresses_known_noise() {
+        // Suppressed: rust-analyzer's superseded/denied request signals.
+        assert!(!should_log_lsp_request_failure(
+            "Get diagnostics via rust-analyzer failed: content modified"
+        ));
+        assert!(!should_log_lsp_request_failure(
+            "Get diagnostics via rust-analyzer failed: server cancelled the request"
+        ));
+
+        // Logged: anything else is a real failure.
+        assert!(should_log_lsp_request_failure(
+            "Get diagnostics via rust-analyzer failed: server shut down"
+        ));
+        assert!(should_log_lsp_request_failure(
+            "Get diagnostics via rust-analyzer failed: Server reset the connection"
+        ));
+        assert!(should_log_lsp_request_failure("something else entirely"));
+    }
+}