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update postStreamScrubber #1944

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update postStreamScrubber #1944

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4 changes: 3 additions & 1 deletion js/src/forum/components/PostStreamScrubber.js
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,7 @@ export default class PostStreamScrubber extends Component {
let index = $items.first().data('index') || 0;
let visible = 0;
let period = '';
let indexUpdated = false;

// Now loop through each of the items in the discussion. An 'item' is
// either a single post or a 'gap' of one or more posts that haven't
Expand All @@ -223,8 +224,9 @@ export default class PostStreamScrubber extends Component {
const visibleBottom = Math.min(height, viewportTop + viewportHeight - top);
const visiblePost = visibleBottom - visibleTop;

if (top <= viewportTop) {
if (!indexUpdated) {
index = parseFloat($this.data('index')) + visibleTop / height;
indexUpdated = true;
}

if (visiblePost > 0) {
Expand Down