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arturovt
5cb4ea7e35
NgModel injects ControlContainer with @Host(), which stops the injector at
the component host element boundary. When NgForm lives in a parent component
and ngModel lives in a child component, the injection returns null silently
and the control acts standalone — never registering with the form.
To surface this invisible failure, emit a dev-mode warning (NG01354) when
ngModel's @Host() injection finds nothing but the element Injector can still
reach a ControlContainer further up the hierarchy. The warning identifies the
cross-boundary issue and points developers to the viewProviders fix or the
standalone option.
Adds the NG01354 reference page explaining why the warning fires and providing
two remediation paths: bridging ControlContainer via viewProviders, or opting
out with [ngModelOptions]="{standalone: true}".
Fixes #47580
(cherry picked from commit 38d093232c)