Ionic v4: Re-add compareWith property to ion-select

Bug Report

Ionic Info Run ionic info from a terminal/cmd prompt and paste the output below.

cli packages: (/usr/local/lib/node_modules)

   @ionic/cli-utils  : 2.0.0-rc.6
   ionic (Ionic CLI) : 4.0.0-rc.6

local packages:

   @angular-devkit/core       : 0.6.8
   @angular-devkit/schematics : 0.6.8
   @angular/cli               : 6.0.8
   @ionic/schematics-angular  : 1.0.0-rc.6
   Ionic Framework            : @ionic/angular 4.0.0-alpha.7

System:

   NodeJS : v8.11.1
   npm    : 6.1.0
   OS     : macOS High Sierra

Describe the Bug ion-select is missing the compareWith Angular property in ionic-angular v4, previously working in v3 with PR #11965.

Steps to Reproduce Steps to reproduce the behavior:

1. Add an <ion-select> element with [compareWith]="compareFunction".
2. The following error is thrown in the console:

Can't bind to 'compareWith' since it isn't a known property of 'ion-select'.
1. If 'ion-select' is an Angular component and it has 'compareWith' input, then verify that it is part of this module.
2. If 'ion-select' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.

Related Code If you are able to illustrate the bug with an example, please provide a sample application via an online code collaborator such as StackBlitz, or GitHub.

Expected Behavior To be able to bind to compareWith in an ion-select.

Additional Context Angular docs for compareWith

[FdezRomero]

@izio38 I wish it were that easy! 😅

For starters, this._compareWith is not defined (not a big deal). But the part I have doubts about is where the compare function should be used as the functionality has now been split between valueChanged() and optLoad().

I’m not sure how the option elements and the select play together, as they now emit a ionSelectOptionDidLoad custom event.

That’s why I decided to open this issue instead of a PR.

Thanks, Rodrigo

[remisture]

When will this be merged?