render called before sub-component's views get to the DOM (this is a regression)

[ctm]

Problem
If a component has a sub-component, under yew 16.0.2, the top-level's render would only be called after the sub-component's view was created and made available to the DOM. That changed with 17.0.

Steps To Reproduce
Steps to reproduce the behavior:

1. I've created a render_sooner_demo branch that has the following steps in it (in examples/custom_components)
2. Add log and wasm-logger to Cargo.toml
3. Add a render method that calls info! to some top-level Component
4. Add a call to info! in the view method of the sub-component
5. Run the app and look at the console output

Expected behavior
In yew 16.0.2 (and previous versions that had render), the info! line would be produced after the info! line for any views from any sub-components. Now it's produced before. That means that a top-level render method can't rely on accessing DOM elements that are created by sub-components.

I have never done any React programming, so I don't know if the new behavior should be considered a bug, but it is definitely surprising and has me momentarily not switching to yew 17.0, although I could add some code to make the sub-component send a message up to the parent after its render has been called.

Screenshots
Here's what happens with 17.0:

Here's what happens with 16.2:

Environment:

• Yew version: v0.17
• Rust version: rustc 1.44.1 (c7087fe00 2020-06-17)
• Target, if relevant: whatever examples/build.sh uses
• Build tool, if relevant: examples/build.sh

Questionnaire

• I'm interested in fixing this myself but don't know where to start
• I would like to fix and I have a solution
• I don't have time to fix this right now, but maybe later
• I don't know that this is.a bug, but if it is, I'm willing to help

[jstarry]

This is indeed a regression, thanks for the report. I'll make sure this gets fixed in a patch release

[jstarry]

Thanks again @ctm! Can you confirm that 0.17.1 fixes your issue?

[ctm]

It does indeed. I've tested it locally and am pushing to production now.