fix: prevent closing submit panel

README.md

@@ -13,7 +13,6 @@ You can download the plugin from the [JetBrains Marketplace](https://plugins.jet
 <!-- Note to writers: A copy of the feature list exists in plugin.xml, please also add your changes there -->
 
 ## Potential future features
-- Prevent closing submit panel
 - Settings UI (login, PDF mode, ...)
 - Display how much time is left in a contest or whether it's already over
 - Implement reading detailed results

src/main/kotlin/io/gitlab/jfronny/sdom/toolwindow/SDToolWindowFactory.kt

@@ -24,7 +24,9 @@ class SDToolWindowFactory : ToolWindowFactory, DumbAware {
         }
 
         val submitPanel = SDSubmitPanel(project)
-        val submitContent = contentManager.factory.createContent(submitPanel.component, "Submit", false)
+        val submitContent = contentManager.factory.createContent(submitPanel.component, "Submit", false).apply {
+            isCloseable = false
+        }
         Disposer.register(toolWindow.disposable, submitPanel)
 
         fun showSubmitContent() {