Create a new task, following :
- Open Terminal menu
- Click in Configure Task
- Select option Create a task.json file from template
- Select option Others
- Paste the content of task.json in the task.json file
To test the task:
- Select some text to you think should be a class file
- open Terminal menu
- click in Run Task and select find_reference
The result should be: the file class should be open in the editor
{
"key": "ctrl+f12",
"command": "workbench.action.tasks.runTask",
"args": "find_reference"
}