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[Merged by Bors] - fix upsert_leaf not setting a MeasureFunc for new leaf nodes #7351

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[Merged by Bors] - fix upsert_leaf not setting a MeasureFunc for new leaf nodes #7351

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ickshonpe
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@ickshonpe ickshonpe commented Jan 24, 2023 •
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Problem

The upsert_leaf method creates a new MeasureFunc and, if required, a new leaf node, but then it only adds the new MeasureFunc to existing leaf nodes.

Solution

Add the MeasureFunc to new leaf nodes as well.

@ickshonpe
changes:
a83c9ef 
    The upsert_leaf method creates a new MeasureFunc and if required a new leaf node,
    but the new MeasureFunc was only added to existing leaf nodes, not newly created nodes.
    This adds the new MeasureFunc to new leaf nodes as well.
    I'm not quite sure how much impact this had or whether this fixes any other bugs.
    It might have caused slight glitches or some UI updates to be delayed for a frame.
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cargo fmt --all
fb814ad
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Oops, this seems like a regression from #6743.

I think this could be a one line diff with new_leaf_with_measure?

@alice-i-cecile alice-i-cecile added C-Bug An unexpected or incorrect behavior A-UI Graphical user interfaces, styles, layouts, and widgets labels Jan 24, 2023
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This LGTM, but I agree that we should be able to do this more concisely.

@alice-i-cecile alice-i-cecile added this to the 0.10 milestone Jan 24, 2023
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Oops, this seems like a regression from #6743.

ah, I should have checked the history.

I think this could be a one line diff with new_leaf_with_measure?

I think this version is probably better, even though it's more verbose.
In the original, the two code paths confound the unused_variable lint.

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Hm. At a glance, new_leaf_with_measure seems to do less work than new_leaf + set_measure.

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rparrett commented Jan 24, 2023 •
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In the original, the two code paths confound the unused_variable lint.

I'm not seeing this on my end. CI runs without error locally with the minimal fix.

@alice-i-cecile alice-i-cecile added the S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it label Jan 24, 2023
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bors r+

bors bot pushed a commit that referenced this pull request Jan 24, 2023
@ickshonpe
fix upsert_leaf not setting a MeasureFunc for new leaf nodes (#7351)
cf612c8 
# Problem

The `upsert_leaf` method creates a new `MeasureFunc` and, if required, a new leaf node, but then it only adds the new `MeasureFunc` to existing leaf nodes.

## Solution

Add the `MeasureFunc` to new leaf nodes as well.
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bors bot commented Jan 24, 2023

Pull request successfully merged into main.

Build succeeded:

@bors bors bot changed the title fix upsert_leaf not setting a MeasureFunc for new leaf nodes [Merged by Bors] - fix upsert_leaf not setting a MeasureFunc for new leaf nodes Jan 24, 2023
@bors bors bot closed this Jan 24, 2023
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ickshonpe commented Jan 24, 2023 •
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In the original, the two code paths confound the unused_variable lint.

I'm not seeing this on my end. CI runs without error locally with the minimal fix.

I meant that in the concise version, the linter didn't detect that the MeasureFunc variable was unused because it was still consumed on the other code path. The longer version is more robust in that we'd get an unused variable warning in that case. I agree that it isn't clear whether there is some hidden performance cost though. Anyway, it doesn't seem worth obsessing about so I put things back as they were.

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rparrett commented Jan 24, 2023 •
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Makes sense, thanks for clarifying. Agreed.

ItsDoot pushed a commit to ItsDoot/bevy that referenced this pull request Feb 1, 2023
@ickshonpe @ItsDoot
fix upsert_leaf not setting a MeasureFunc for new leaf nodes (bevyeng…
7753e60 
…ine#7351)

# Problem

The `upsert_leaf` method creates a new `MeasureFunc` and, if required, a new leaf node, but then it only adds the new `MeasureFunc` to existing leaf nodes.

## Solution

Add the `MeasureFunc` to new leaf nodes as well.
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@rparrett rparrett rparrett approved these changes

@alice-i-cecile alice-i-cecile alice-i-cecile approved these changes

@Weibye Weibye Awaiting requested review from Weibye

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