fix(angular): keepContentsMounted modal is sized correctly

[liamdebeasi]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue URL: resolves #26916

The fix in 00d10f5 uncovered an issue in the angular modal integration where .ion-page was being added twice when keepContentsMounted="true".

The reason is that we add an .ion-page element on mount:

ionic-framework/angular/src/directives/overlays/modal.ts

Line 83 in 66f2ecb

template: `<div class="ion-page" *ngIf="isCmpOpen || keepContentsMounted">

. However, this causes the following condition to be true in our core framework delegate:

ionic-framework/core/src/utils/framework-delegate.ts

Line 91 in 66f2ecb

} else if (BaseComponent.children.length > 0) {

As a result, .ion-delegate-host and .ion-page are added. However, we then append the children inside of the modal. This results in the .ion-page that Angular created to be added inside another .ion-page.

We have a check to prevent duplicate work by checking ion-delegate-host is present, but the Angular modal never had that class applied.

This issue has been around for quite a while, but we only noticed it in v6.6.0. As a result, I'm not considering this a regression.

What is the new behavior?

• Added .ion-delegate-host to the element that the Angular modal creates.
• Added a test.

Does this introduce a breaking change?

• Yes
• No

Other information

Dev build: 6.6.1-dev.11678112836.1733c8ec

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