Merge pull request #2893 from wbkd/fix/handle-connectable

fix(handles): check if handle is connectable closes #2869

.changeset/rare-points-change.md

@@ -1,5 +1,5 @@
 ---
-'@reactflow/core': major
+'@reactflow/core': patch
 ---
 
 track modifier keys on useKeypress

.changeset/real-cats-sneeze.md

@@ -0,0 +1,5 @@
+---
+'@reactflow/core': patch
+---
+
+fix: check if handle is connectable

packages/core/src/components/Handle/utils.ts

@@ -104,9 +104,10 @@ export function isValidHandle(
 
     // in strict mode we don't allow target to target or source to source connections
     const isValid =
-      connectionMode === ConnectionMode.Strict
+      handleToCheck.classList.contains('connectable') &&
+      (connectionMode === ConnectionMode.Strict
         ? (isTarget && handleType === 'source') || (!isTarget && handleType === 'target')
-        : handleNodeId !== fromNodeId || handleId !== fromHandleId;
+        : handleNodeId !== fromNodeId || handleId !== fromHandleId);
 
     if (isValid) {
       result.isValid = isValidConnection(connection);