Fix #2376 Error when generating event listeners in read only file

Author: RedNesto

src/main/kotlin/insight/generation/GenerateEventListenerHandler.kt

@@ -28,6 +28,7 @@ import com.demonwav.mcdev.util.mapFirstNotNull
 import com.intellij.codeInsight.CodeInsightActionHandler
 import com.intellij.ide.util.TreeClassChooserFactory
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.EditorModificationUtil
 import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiClass
 import com.intellij.psi.PsiFile
@@ -43,6 +44,10 @@ class GenerateEventListenerHandler : CodeInsightActionHandler {
         val caretElement = file.findElementAt(editor.caretModel.offset) ?: return
         val context = caretElement.context ?: return
 
+        if (!EditorModificationUtil.requestWriting(editor)) {
+            return
+        }
+
         val chooser = TreeClassChooserFactory.getInstance(project)
             .createWithInnerClassesScopeChooser(
                 RefactoringBundle.message("choose.destination.class"),