Ticket #42674: 42674.diff

src/wp-admin/js/customize-controls.js

@@ -3074 +3074 @@
                         api.Panel.prototype.attachEvents.apply( panel );
 
                         // Temporary since supplying SFTP credentials does not work yet. See #42184
-                        if ( api.settings.theme._filesystemCredentialsNeeded ) {
+                        if ( api.settings.theme._canInstall && api.settings.theme._filesystemCredentialsNeeded ) {
                                 panel.notifications.add( new api.Notification( 'theme_install_unavailable', {
                                         message: api.l10n.themeInstallUnavailable,
                                         type: 'info',
@@ -5132 +5132 @@
 
                         // Temporary special function since supplying SFTP credentials does not work yet. See #42184.
                         function disableInstallButtons() {
-                                return disableSwitchButtons() || true === api.settings.theme._filesystemCredentialsNeeded;
+                                return disableSwitchButtons() || false === api.settings.theme._canInstall || true === api.settings.theme._filesystemCredentialsNeeded;
                         }
                         function updateButtons() {
                                 control.container.find( 'button.preview, button.preview-theme' ).toggleClass( 'disabled', disableSwitchButtons() );

src/wp-includes/class-wp-customize-manager.php

@@ -4702 +4702 @@
                                 'previewFrameSensitivity' => 2000,
                         ),
                         'theme'                  => array(
-                                'stylesheet' => $this->get_stylesheet(),
-                                'active'     => $this->is_theme_active(),
+                                'stylesheet'  => $this->get_stylesheet(),
+                                'active'      => $this->is_theme_active(),
+                                '_canInstall' => current_user_can( 'install_themes' ),
                         ),
                         'url'                    => array(
                                 'preview'       => esc_url_raw( $this->get_preview_url() ),