theming: default set to theia-file-icons (#12346)

The commit sets the default file-icon theme to `theia-file-icons` instead of `none`.

Signed-off-by: FernandoAscencio <fernando.ascencio,[email protected]>

Author: FernandoAscencio

CHANGELOG.md

@@ -8,6 +8,7 @@
 
 <a name="breaking_changes_1.36.0">[Breaking Changes:](#breaking_changes_1.36.0)</a>
 
+- [core] changed default icon theme from `none` to `theia-file-icons` [#11028](https://github.com/eclipse-theia/theia/pull/12346)
 - [plugin] renamed `TreeViewExtImpl#toTreeItem()` to `TreeViewExtImpl#toTreeElement()`
 - [scm] Fixing 'scm' inline commands, introduces the following breaking changes: [#12295](https://github.com/eclipse-theia/theia/pull/12295)
     - Interface ScmInlineAction removes 'commands: CommandRegistry'

dev-packages/application-package/src/application-props.ts

@@ -70,7 +70,7 @@ export namespace FrontendApplicationConfig {
     export const DEFAULT: FrontendApplicationConfig = {
         applicationName: 'Eclipse Theia',
         defaultTheme: { light: 'light', dark: 'dark' },
-        defaultIconTheme: 'none',
+        defaultIconTheme: 'theia-file-icons',
         electron: ElectronFrontendApplicationConfig.DEFAULT,
         defaultLocale: '',
         validatePreferencesSchema: true