Broken nested MatGridList

[pupizoid]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

mat-grid-tile should take cols attribute from closest mat-grid-list element

What is the current behavior?

The cols attribute value is taken from the furthest mat-grid-list which makes impossible nesting one list to another with different settings.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-ra3y88

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

@angular-devkit/architect 0.7.1
@angular-devkit/build-angular 0.7.1
@angular-devkit/build-optimizer 0.7.1
@angular-devkit/build-webpack 0.7.1
@angular-devkit/core 0.7.1
@angular-devkit/schematics 0.8.1
@angular/cdk 6.4.7
@angular/cli 6.2.1
@angular/material 6.4.7
@ngtools/webpack 6.1.1
@schematics/angular 0.8.1
@schematics/update 0.8.1
rxjs 6.3.2
typescript 2.9.2
webpack 4.9.2

Is there anything else we should know?

This is broken after update @angular/material from 6.4.6 to 6.4.7

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