Changing content used for empty match
When an empty expression is used in alternation with something else (such as `(|test)`) the empty expression was using its empty group as a placeholder element for calculating its anchor position. This calculation was incorrect and was leading to the alternation not being centered vertically. Using any element with height and width fixes this. Fixes #16
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@ -62,8 +62,11 @@ export default {
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// This leads to a Match node with no fragments, no start indicator, and
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// no end indicator. Something must be rendered so that the anchor can be
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// calculated based on it.
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//
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// Furthermore, the content rendered must have height and width or else the
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// anchor calculations fail.
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if (items.length === 0) {
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items = [this.container.group()];
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items = [this.container.group().path('M0,0h10')];
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}
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return Promise.all(items)
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