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[FrameworkBundle] Added doc for ControllerTrait::isFormValid

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Original file line number	Diff line number	Diff line change
@@ -218,4 +218,21 @@ handling the form submit. For example, you could have a ``new()`` action that
`218`	`218`	`submit. Both those actions will be almost identical. So it's much simpler to let`
`219`	`219`	``new()`` handle everything.
`220`	`220`
	`221`	`+..versionadded::4.3`
	`222`	`+`
	`223`	+ The ``AbstractController::isFormValid()`` method was added in Symfony 4.3.
	`224`	`+`
	`225`	+It's also possible to use a short-cut if the ``AbstractController`` is extended::
	`226`	`+`
	`227`	`+ public function new(Request $request)`
	`228`	`+ {`
	`229`	`+ // build the form ...`
	`230`	`+`
	`231`	`+ if ($this->isFormValid($form, $request)) {`
	`232`	`+ // process the form data`
	`233`	`+ }`
	`234`	`+`
	`235`	`+ // render the template`
	`236`	`+ }`
	`237`	`+`
`221`	`238`	Next::doc:`/best_practices/i18n`

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Original file line number	Diff line number	Diff line change
`@@ -264,6 +264,25 @@ your controller::`
`264`	`264`	is called. Otherwise, changes done in the ``*_SUBMIT`` events aren't applied to the
`265`	`265`	`view (like validation errors).`
`266`	`266`
	`267`	`+`
	`268`	`+..versionadded::4.3`
	`269`	`+`
	`270`	+ The ``AbstractController::isFormValid()`` method was added in Symfony 4.3.
	`271`	`+`
	`272`	+It's also possible to use a short-cut if the ``AbstractController`` is extended::
	`273`	`+`
	`274`	`+ public function new(Request $request)`
	`275`	`+ {`
	`276`	`+ // build the form ...`
	`277`	`+`
	`278`	`+ if ($this->isFormValid($form, $request)) {`
	`279`	`+ // process the form data`
	`280`	`+ }`
	`281`	`+`
	`282`	`+ // render the template`
	`283`	`+ }`
	`284`	`+`
	`285`	`+`
`267`	`286`	`This controller follows a common pattern for handling forms and has three`
`268`	`287`	`possible paths:`
`269`	`288`

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