fix: loading api-format workflow that contains "parameters" string

browser_tests/tests/loadWorkflowInMedia.spec.ts

@@ -12,6 +12,7 @@ test.describe('Load Workflow in Media', () => {
     'edited_workflow.webp',
     'no_workflow.webp',
     'large_workflow.webp',
+    'workflow_prompt_parameters.png',
     'workflow.webm',
     // Skipped due to 3d widget unstable visual result.
     // 3d widget shows grid after fully loaded.

src/scripts/app.ts

@@ -1468,7 +1468,21 @@ export class ComfyApp {
       }
     }
 
-    // Use parameters as fallback when no workflow exists
+    if (prompt) {
+      try {
+        const promptObj =
+          typeof prompt === 'string' ? JSON.parse(prompt) : prompt
+        if (this.isApiJson(promptObj)) {
+          this.loadApiJson(promptObj as ComfyApiWorkflow, fileName)
+          return
+        }
+      } catch (err) {
+        console.error('Failed to parse prompt:', err)
+      }
+      // Fall through to parameters as a last resort
+    }
+
+    // Use parameters strictly as the final fallback
     if (parameters) {
       // Note: Not putting this in `importA1111` as it is mostly not used
       // by external callers, and `importA1111` has no access to `app`.
@@ -1481,12 +1495,6 @@ export class ComfyApp {
       return
     }
 
-    if (prompt) {
-      const promptObj = typeof prompt === 'string' ? JSON.parse(prompt) : prompt
-      this.loadApiJson(promptObj, fileName)
-      return
-    }
-
     this.showErrorOnFileLoad(file)
   }