Fix unable to set progress value to 0#2757
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JoviDeCroock
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Sep 19, 2020
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| // despite the attribute not being present. When the attribute | ||
| // is missing the progress bar is treated as indeterminate. | ||
| // To fix that we'll always update it when it is 0 for progress elements | ||
| (i !== dom.value || (newVNode.type === 'progress' && !i)) |
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Turns out my previous fix of doing !dom.hasAttribute('value') is not a good one as it leads to all input values always being updated. The new fix only updates it, despite dom.value === props.value when the value is 0 for progress elements.
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Due to a weird oddity in the DOM interface the value
0is only treated as0when thevalueattribute is present. When the value is not present the progress bar is treated as being indeterminate. But the problem is that the DOM interface will always have all properties and the initial value forvalueis 0. This mismatch caused us to never set the progress bar value to0Fixes #2756 .