Don't offer updates for @snapshot@ plugin version

idea/src/org/jetbrains/kotlin/idea/KotlinPluginUpdater.kt

@@ -133,6 +133,10 @@ class KotlinPluginUpdater(val propertiesComponent: PropertiesComponent) : Dispos
 
     private fun updateCheck(callback: (PluginUpdateStatus) -> Boolean) {
         var updateStatus: PluginUpdateStatus
+        if (KotlinPluginUtil.isSnapshotVersion()) {
+            updateStatus = PluginUpdateStatus.LatestVersionInstalled
+        }
+        else {
             try {
                 updateStatus = checkUpdatesInMainRepository()
 
@@ -144,6 +148,7 @@ class KotlinPluginUpdater(val propertiesComponent: PropertiesComponent) : Dispos
             catch(e: Exception) {
                 updateStatus = PluginUpdateStatus.fromException("Kotlin plugin update check failed", e)
             }
+        }
 
         lastUpdateStatus = updateStatus
         checkQueued = false

idea/src/org/jetbrains/kotlin/idea/KotlinPluginUtil.java

@@ -37,6 +37,10 @@ public class KotlinPluginUtil {
         return plugin.getVersion();
     }
 
+    public static boolean isSnapshotVersion() {
+        return "@snapshot@".equals(getPluginVersion());
+    }
+
     public static boolean isAndroidGradleModule(@NotNull Module module) {
         return KotlinModuleTypeManager.getInstance().isAndroidGradleModule(module);
     }

idea/src/org/jetbrains/kotlin/idea/versions/OutdatedKotlinRuntimeChecker.kt

@@ -37,7 +37,7 @@ data class VersionedLibrary(val library: Library, val version: String?, val used
 
 fun findOutdatedKotlinLibraries(project: Project): List<VersionedLibrary> {
     val pluginVersion = KotlinPluginUtil.getPluginVersion()
-    if ("@snapshot@" == pluginVersion) return emptyList() // plugin is run from sources, can't compare versions
+    if (KotlinPluginUtil.isSnapshotVersion()) return emptyList() // plugin is run from sources, can't compare versions
 
     // user already clicked suppress
     if (pluginVersion == PropertiesComponent.getInstance(project).getValue(SUPPRESSED_PROPERTY_NAME)) {