fix: disable open keymap split editor from toolbar

The complete support for split editor is yet to be added to IDE2.
For now, this commit turns off opening the keymaps in the JSON
split editor. So that it cannot get the primary IDE2 layout into an
inconsistent state.

Closes arduino/arduino-ide#1850

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/contributions/user-fields.ts

@@ -74,9 +74,7 @@ export class UserFields extends Contribution {
   async checkUserFieldsDialog(forceOpen = false): Promise<boolean> {
     const key = this.selectedFqbnAddress();
     if (!key) {
-      // Let the upload continue without an FQBN and the CLI fail instead of disabling the upload from IDE.
-      // https://github.com/arduino/arduino-ide/issues/1714
-      return true;
+      return false;
     }
     /*
       If the board requires to be configured with user fields, we want

arduino-ide-extension/src/browser/theia/keymaps/keymaps-frontend-contribution.ts

@@ -1,14 +1,20 @@
+import { CommandRegistry } from '@theia/core/lib/common/command';
+import { MenuModelRegistry } from '@theia/core/lib/common/menu/menu-model-registry';
+import { nls } from '@theia/core/lib/common/nls';
 import { injectable } from '@theia/core/shared/inversify';
-import { MenuModelRegistry } from '@theia/core';
 import {
-  KeymapsFrontendContribution as TheiaKeymapsFrontendContribution,
   KeymapsCommands,
+  KeymapsFrontendContribution as TheiaKeymapsFrontendContribution,
 } from '@theia/keymaps/lib/browser/keymaps-frontend-contribution';
 import { ArduinoMenus } from '../../menu/arduino-menus';
-import { nls } from '@theia/core/lib/common';
 
 @injectable()
 export class KeymapsFrontendContribution extends TheiaKeymapsFrontendContribution {
+  override registerCommands(registry: CommandRegistry): void {
+    super.registerCommands(registry);
+    registry.unregisterCommand(KeymapsCommands.OPEN_KEYMAPS_JSON_TOOLBAR.id);
+  }
+
   override registerMenus(menus: MenuModelRegistry): void {
     menus.registerMenuAction(ArduinoMenus.FILE__ADVANCED_SUBMENU, {
       commandId: KeymapsCommands.OPEN_KEYMAPS.id,