ui_bookmarks breaks column configuration

[LBannenberg]

Affected version: 0.7.0
Last good version: 0.6.4

If you define a getColumns() method in your ArrayProvider, it's called when the grid is rendered the first time. After that however, \Loki\AdminComponents\Component\Grid\GridViewModel::getAvailableColumns first tries to retrieve columns from the bookmarks and if that succeeds, skips the provider:

https://github.com/LokiExtensions/Loki_AdminComponents/blob/0.7.0/Component/Grid/GridViewModel.php#L198

public function getAvailableColumns(): array
    {
        $columns = $this->columnLoader->getColumnsFromNamespace($this->getNamespace());
        if (!empty($columns)) { // true the second time
            return $columns;
        }

        $providerHandler = $this->getRepository()->getProviderHandler();
        $provider = $this->getRepository()->getProvider();
        $columns = $providerHandler->getColumns($provider); // called the first time, skipped the second time

I noticed this because suddenly my cell templates and column labels were being ignored. For example:

https://github.com/LBannenberg/magento2-composer-dashboard/blob/main/src/Provider/InstalledPackagesArrayProvider.php#L22

public function getColumns(): array
    {
        return [
            $this->columnFactory->create([
                'code' => 'package',
                'label' => 'Package',
                'cell_template' => 'Corrivate_ComposerDashboard::grid/cell/package-name.phtml'
            ]),

When the column is created from the bookmark, it doesn't use the same data:

https://github.com/LokiExtensions/Loki_AdminComponents/blob/0.7.0/Grid/ColumnLoader.php#L85

            $columns[] = $this->columnFactory->create([
                'code' => $columnName,
                'visible' => $visible,
                'position' => (isset($positions[$columnName])) ? $positions[$columnName] : 99,
            ]);

Which visually looks like this on first load:

And on reload:

[jissereitsma]

So I think the solution would need to be to merge the uiBookmark info and the other data (in your case, from the provider). Something similar to this: db0cc65

I still need to test whether this works.