Replicate internal API code [skip ci]

src/main/kotlin/it/casaricci/hass/plugin/internal/PlatformUtils.kt

@@ -0,0 +1,34 @@
+package it.casaricci.hass.plugin.internal
+
+/**
+ * Adapted from IntelliJ SDK because it's an internal API.
+ */
+object PlatformUtils {
+    private const val PLATFORM_PREFIX_KEY: String = "idea.platform.prefix"
+    private const val IDEA_PREFIX: String = "idea"
+
+    private fun getPlatformPrefix(): String {
+        return getPlatformPrefix(IDEA_PREFIX)
+    }
+
+    private fun getPlatformPrefix(defaultPrefix: String?): String {
+        return System.getProperty(PLATFORM_PREFIX_KEY, defaultPrefix)
+    }
+
+    private fun `is`(idePrefix: String): Boolean {
+        return idePrefix == getPlatformPrefix()
+    }
+
+    private fun isIdeaUltimate(): Boolean {
+        return `is`("idea")
+    }
+
+    private fun isIdeaCommunity(): Boolean {
+        return `is`("Idea")
+    }
+
+    fun isIntelliJ(): Boolean {
+        return isIdeaUltimate() || isIdeaCommunity() || `is`("IdeaEdu")
+    }
+
+}

src/main/kotlin/it/casaricci/hass/plugin/settings/ProjectSettingsConfigurableProvider.kt

@@ -3,7 +3,7 @@ package it.casaricci.hass.plugin.settings
 import com.intellij.openapi.options.Configurable
 import com.intellij.openapi.options.ConfigurableProvider
 import com.intellij.openapi.project.Project
-import com.intellij.util.PlatformUtils
+import it.casaricci.hass.plugin.internal.PlatformUtils
 
 class ProjectSettingsConfigurableProvider(private val project: Project) : ConfigurableProvider() {
 
@@ -20,5 +20,4 @@ class ProjectSettingsConfigurableProvider(private val project: Project) : Config
 /**
  * Only IntelliJ IDEA supports facets, apparently. For all other IDEs we will use project settings.
  */
-@Suppress("UnstableApiUsage")
 fun usesProjectSettings(): Boolean = !PlatformUtils.isIntelliJ()