`ContentExportForm::buildForm()` runs the full export on every page load just to fill the "Exported content" preview. That value is then thrown away, as both submit handlers call `doExportToYml()` again, so opening the page and downloading exports the entity twice. If a user does not copy the preview and instead downloads the file, the whole preview build is wasted. On heavily referenced content, the preview can also become extremely slow.
Add a new setting, "Build the content preview on demand" (off by default, so nothing changes for existing sites). When it is on, the export page renders a "Show exported content" button in place of the field and never calls `doExportToYml()` on load. Pressing the button swaps the field in over AJAX. Ace is no longer loaded on page load either. Downloads are untouched.
With the setting on and no preview requested, `$form['output']` is a container rather than a textarea.
New config `single_content_sync.settings:export_preview_on_demand` (boolean, default `FALSE`).
Show commandsStart within a Git clone of the project using the version control instructions.
Or, if you do not have SSH keys set up on git.drupalcode.org:
changes
Comments
Comment #3
alex.bukach commented