clear selection on htmlRender (#544)

Wino.Mail/JS/reader.html

@@ -35,8 +35,13 @@
 
             // Called when rendering a new email for the first time
             function RenderHTML(htmlString, shouldLinkifyText = true) {
+
+                // Reset scroll to top
                 window.scroll(0, 0);
 
+                // Clear any existing selection
+                window.getSelection().removeAllRanges();
+
                 _htmlString = htmlString;
                 _shouldLinkifyText = shouldLinkifyText;