OPENIDE #186 Add ability hide welcome screen via settings

(cherry picked from commit 1a2f018be6)
(cherry picked from commit bef58cefe3)
(cherry picked from commit 52426ad583)

platform/platform-impl/src/ru/openide/welcome/screen/OpenIdeWelcomeScreenProjectActivity.kt

@@ -23,6 +23,7 @@ import com.intellij.openapi.project.DumbService
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.startup.ProjectActivity
 import com.intellij.openapi.startup.StartupManager
+import com.intellij.openapi.util.registry.RegistryManager
 import com.intellij.util.concurrency.AppExecutorUtil
 import java.util.concurrent.Callable
 
@@ -59,6 +60,12 @@ class OpenIdeWelcomeScreenProjectActivity : ProjectActivity {
   private fun showWelcomeScreen(project: Project, isFirstOpen: Boolean) {
     if (!isFirstOpen) return
     OpenIdeProjectLocalState.getInstance(project).isFirstOpen = false
+
+    val isShowWelcomeScreen = RegistryManager.getInstance()
+      .get("openide.registry.key.show.welcome.screen")
+      .asBoolean()
+    if (!isShowWelcomeScreen) return
+
     WelcomeScreenHelper(project).showWelcomeScreen()
   }
 }

platform/platform-resources/src/META-INF/LangExtensions.xml

@@ -1761,6 +1761,8 @@
                  description="Enable open in client generator action"/>
     <registryKey key="editor.show.indexing.as.analyzing" defaultValue="true"
                  description="Replaces Indexing progress with Analyzing during dumb mode"/>
+    <registryKey key="openide.registry.key.show.welcome.screen" defaultValue="true"
+                 description="Enables the Welcome Screen to be shown when opening a project for the first time"/>
 
     <saveAndSyncHandlerListener implementation="com.intellij.codeInsight.daemon.impl.EssentialHighlightingRestarter" />