[wpf-graphics-rendering-overview.md] clarifying VisualTree traversal order

[glenn-slayden]

copyedit (medium): one paragraph, for your consideration and review.

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[adegeo]

Hi @glenn-slayden

I'll need to do some investigating on this PR as it's changing some of the wording that's very specific to behavior. I assume that when this content was originally written, it was done so with the product group. Like, why was "left to right" chosen as the phrase to communicate render order? Is it true? Does position factor into sibling rendering? I'll have to explore the code or find someone that knows more than myself.

Another example is that you introduced "child nodes are always rendered first" is that 100% without a doubt true? Or is this an assumption? Can something else in code or in behavior actually alter the order so that it isn't true? I don't know.

I'm curious, what's the motivation behind this PR?

[adegeo]

@dotnet/wpf-developers

[glenn-slayden]

Thanks for the feedback. As you can check my logs, I don't make many PRs, but when I do I hope the information is solid, especially when proffered to a serious commercial venture. I am a past MS SDE dev and have specialized in working on Visual/Drawing/DrawingVisual-level code for WPF since it started in 2007 or so. I even have a few "actually retained graphics" successes in this type of WPF design, which is admittedly off-the-beaten-path. Most people just stick with the Measure/Arrange layout pass model since it's easier and more comprehensible.

Retained-mode programming on WPF is not easy, but its reasonably capable and fantastically performant when it works. Just trying to improve things, but if my submission doesn't satisfy your standards then it's no offense.

[adegeo]

Thanks for the response Glenn! I'll dive into this PR. The only reason I was questioning you is just the fact that there are so many AI bots that do these odd wording changes, so as soon as I start asking questions with no response I sort of get the idea.

My only concern is for myself, I just don't know that much about it to validate a submission in this area. Considering the holiday season is now over, I hope to get some of the WPF product group to look at it. From my point of view it seems solid, but I just want them to give a stamp of approval.

Thanks again, and I appreciate your thoroughness!