Handle timestamp in Markdown.

The videojs player is exposed through the 'window' object.

CHANGELOG.md

@@ -18,6 +18,16 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 
+- Turn timestamps in a video's description and comments into links _community pr!_ ([#5156](https://github.com/lbryio/lbry-desktop/pull/5156))
+
+### Changed
+
+### Fixed
+
+## [0.49.0] - [2020-12-10]
+
+### Added
+
 - Better search suggestions ([#5124](https://github.com/lbryio/lbry-desktop/pull/5124))
 - Inline video player in comments/markdown posts ([#4894](https://github.com/lbryio/lbry-desktop/pull/4894))
 - Better handling of winning claim + top page improvements ([#4944](https://github.com/lbryio/lbry-desktop/pull/4944))

ui/component/markdownLink/view.jsx

@@ -62,10 +62,27 @@ function MarkdownLink(props: Props) {
     }
   }
 
-  // Return plain text if no valid url
-  // Return external link if protocol is http or https
-  // Return local link if protocol is lbry uri
-  if (!simpleLinks && ((protocol && protocol[0] === 'lbry:' && isURIValid(decodedUri)) || lbryUrlFromLink)) {
+  if (href.startsWith('?t=')) {
+    // Video timestamp markers
+    element = (
+      <Button
+        button="link"
+        iconRight={undefined}
+        title={title || decodedUri}
+        label={children}
+        className="button--external-link"
+        onClick={() => {
+          if (window.player) {
+            window.player.currentTime(parseInt(href.substr(3)));
+            window.scrollTo(0, 0);
+          }
+        }}
+      />
+    );
+  } else if (!simpleLinks && ((protocol && protocol[0] === 'lbry:' && isURIValid(decodedUri)) || lbryUrlFromLink)) {
+    // Return plain text if no valid url
+    // Return external link if protocol is http or https
+    // Return local link if protocol is lbry uri
     element = (
       <ClaimLink
         uri={lbryUrlFromLink || decodedUri}

ui/component/viewers/videoViewer/internal/videojs.jsx

@@ -345,6 +345,8 @@ export default React.memo<Props>(function VideoJs(props: Props) {
         }
       });
 
+      window.player = player;
+
       // fixes #3498 (https://github.com/lbryio/lbry-desktop/issues/3498)
       // summary: on firefox the focus would stick to the fullscreen button which caused buggy behavior with spacebar
       // $FlowFixMe
@@ -357,6 +359,7 @@ export default React.memo<Props>(function VideoJs(props: Props) {
 
         if (player) {
           player.dispose();
+          window.player = undefined;
         }
       };
     }