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Document Twig test "rootform"

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Original file line number	Diff line number	Diff line change
`@@ -217,6 +217,30 @@ array).`
`217`	`217`
`218`	`218`	`<option {% if choice is selectedchoice(value) %} selected="selected"{% endif %} ...>`
`219`	`219`
	`220`	`+.. _form-twig-rootform:`
	`221`	`+`
	`222`	`+rootform`
	`223`	`+~~~~~~~~`
	`224`	`+`
	`225`	+This test will check for sure if the current ``form`` does not have a parent form view.
	`226`	+It would avoid collision and odd behavior when your form has defined a ``parent`` field.
	`227`	`+`
	`228`	+Wrong example if your form has a field named ``parent``:
	`229`	`+`
	`230`	`+..code-block::jinja`
	`231`	`+`
	`232`	`+ {% if form.parent is null %}`
	`233`	`+ {{ form_errors(form) }}`
	`234`	`+ {% endif %}`
	`235`	`+`
	`236`	+Correct example, this will check for the parent form view rather than its ``parent`` field:
	`237`	`+`
	`238`	`+..code-block::jinja`
	`239`	`+`
	`240`	`+ {% if form is rootform %}`
	`241`	`+ {{ form_errors(form) }}`
	`242`	`+ {% endif %}`
	`243`	`+`
`220`	`244`	.. _`twig-reference-form-variables`:
`221`	`245`
`222`	`246`	`More about Form Variables`

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Original file line number	Diff line number	Diff line change
`@@ -750,6 +750,19 @@ selectedchoice`
`750`	`750`	Checks if ``selectedValue`` was checked for the provided choice field. Using
`751`	`751`	`this test is the most effective way.`
`752`	`752`
	`753`	`+rootform`
	`754`	`+~~~~~~~~`
	`755`	`+`
	`756`	`+..code-block::twig`
	`757`	`+`
	`758`	`+ {% if form is rootform %}`
	`759`	`+`
	`760`	+``form``
	`761`	+ type: ``FormView``
	`762`	`+`
	`763`	+Checks for sure if the current ``form`` does not have a parent form view. Using
	`764`	+this test is the safest way if your form contains a ``parent`` field.
	`765`	`+`
`753`	`766`	`Global Variables`
`754`	`767`	`----------------`
`755`	`768`

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