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Check for NaN when image sizes have changed #31355

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Fixes the issue where the core image block breaks if an empty value is passed back to the callback. The size attribute is set to NaN, causing the block to get corrupted after saving as well.

Closes #16942.

@vdwijngaert vdwijngaert requested a review from gwwar April 29, 2021 19:01
@vdwijngaert vdwijngaert added [Block] Image Affects the Image Block [Type] Bug An existing feature does not function as intended labels Apr 29, 2021
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Size Change: +24 B (0%)

Total Size: 1.31 MB

Filename Size Change
build/block-editor/index.js 116 kB +24 B (0%)
ℹ️ View Unchanged
Filename Size Change
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compressed-size-action

@Mamaduka
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Hi, @vdwijngaert

Maybe we should fix this inside ImageSizeControl component? Return undefined when the value is empty.

@vdwijngaert
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Hey @Mamaduka. I thought about doing it there, but I wasn't sure about the implications it might have on other components. I saw the LatestPosts block also has its own way of dealing with changes:

{ ( value ) => {
	const newAttrs = {};
	if ( value.hasOwnProperty( 'width' ) ) {
		newAttrs.featuredImageSizeWidth =
			value.width;
	}
	if ( value.hasOwnProperty( 'height' ) ) {
		newAttrs.featuredImageSizeHeight =
			value.height;
	}
	setAttributes( newAttrs );
} }

ImageSizeControl does this on change:

( value ) => onChange( { width: parseInt( value, 10 ) } );

So that explains the NaN. Hard to decide where the responsibilities of ImageSizeControl end.

@gwwar
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gwwar commented May 3, 2021

I wasn't sure about the implications it might have on other components.

A quick audit shows that this is in used in latest posts, image and media text blocks, so I think this is pretty manageable.

Maybe we should fix this inside ImageSizeControl component? Return undefined when the value is empty.

I think this is worth a try. It's likely that other blocks that use ImageSizeControl with the default onChange function will run into the similar issues. To improve our confidence with ImageSizeControl, it'd be worth simulating these cases with unit tests. @vdwijngaert do you feel comfortable trying this?

@vdwijngaert
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@vdwijngaert do you feel comfortable trying this?

@gwwar Haha, yes, I think I can handle that :) Do we need a distinction between invalid (NaN) and empty (undefined), or just drop the NaN and return either undefined or an integer? Note to self: we need to update the readme as well if we do this.

@gwwar
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gwwar commented May 3, 2021

Do we need a distinction between invalid (NaN) and empty (undefined)

I think giving a reasonable return value around boundaries (eg 1 or default width/height for invalid input) would be most useful. We can play around with this a bit and see what most components need in terms of behavior.

@Mamaduka
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Mamaduka commented May 4, 2021

"Media & Text" block doesn't use width/height options from the ImageSizeControl component.

@vdwijngaert
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@gwwar, I came around to moving the changes to ImageSizeControl. Do you still think we need tests for this rather small enhancement? After all, it's still up to the parent component do handle changes sent back using the onChange prop.

@@ -67,7 +78,7 @@ export default function ImageSizeControl( {
min={ 1 }
onChange={ ( value ) =>
onChange( {
height: parseInt( value, 10 ),
height: normalizeDimension( value ),
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Maybe we can just use ternary here and check for "falsy" values. Example: value ? parseInt( value, 10 ) : undefined

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Let me know if you'd like to add unit tests or not and I can circle back for a round of manual testing 🛠️

@@ -33,6 +33,15 @@ export default function ImageSizeControl( {
};
}

// Normalize the changed dimension before passing it on.
function normalizeDimension( dimension ) {
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🤔 should updateDimensions be sanitized in a similar way?

return isNaN( parsedDimension ) || parsedDimension <= 0
? undefined
: parsedDimension;
}
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Unit tests are pretty cheap, and considering how many times this bug has popped up in a few places I think it'd be worth it. It's also fine later if we decide that it doesn't have much value and we can 🔪 remove it in a follow up PR

So, I won't block the PR on this, but this is pretty easily unit testable if we make a few small changes, with moving the declaration above ImageSizeControl and passing through onChange as a parameter. We can then easily mock and spy on the onChange function in jest. As a bonus, we only declare these functions once rather than each time during render. (If folks decide to go this route and get stuck with the testing setup I'm happy to provide additional help).

So all together the signature changes might look something like:

function normalizeDimension( dimension ) { //can also just export this if you're more interested in testing this
    //...
}

export default function normalizeWidth( value, onChange ) {
  return onChange( { width: normalizeDimension( value ) } );
}

export default function normalizeHeight( value, onChange ) {
 return onChange( { height: normalizeDimension( value ) } );
}

export default function ImageSizeControl( {

//...
<TextControl
	type="number"
	className="block-editor-image-size-control__width"
	label={ __( 'Width' ) }
	value={ width ?? imageWidth ?? '' }
	min={ 1 }
	onChange={ normalizeWidth }

@Mamaduka
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It looks like the original issue got resolved by other PR #32524.

@Mamaduka Mamaduka closed this Jul 22, 2021
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Core Image Block breaks if size fields are blank
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