force check for update after import settings (IDEA-99559)

platform/platform-impl/src/com/intellij/ide/actions/ImportSettingsAction.java

@@ -32,6 +32,7 @@ import com.intellij.openapi.application.PathManager;
 import com.intellij.openapi.components.ExportableComponent;
 import com.intellij.openapi.project.DumbAware;
 import com.intellij.openapi.ui.Messages;
+import com.intellij.openapi.updateSettings.impl.UpdateSettings;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.util.io.ZipUtil;
 
@@ -103,6 +104,8 @@ public class ImportSettingsAction extends AnAction implements DumbAware {
       StartupActionScriptManager.ActionCommand deleteTemp = new StartupActionScriptManager.DeleteCommand(tempFile);
       StartupActionScriptManager.addActionCommand(deleteTemp);
 
+      UpdateSettings.getInstance().forceCheckForUpdateAfterRestart();
+
       String key = ApplicationManager.getApplication().isRestartCapable()
                    ? "message.settings.imported.successfully.restart"
                    : "message.settings.imported.successfully";

platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/UpdateSettings.java

@@ -129,4 +129,8 @@ public class UpdateSettings implements PersistentStateComponent<Element>, UserUp
   public ChannelStatus getSelectedChannelStatus() {
     return ChannelStatus.fromCode(UPDATE_CHANNEL_TYPE);
   }
+
+  public void forceCheckForUpdateAfterRestart() {
+    LAST_TIME_CHECKED = 0;
+  }
 }