<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><font face="monospace" class=""><span style="white-space: pre-wrap;" class="">> However, why is text scrolling implemente with left mouse button?</span></font><div class=""><font face="monospace" class=""><span style="white-space: pre-wrap;" class="">> I would expect to use middle button as in the original system.</span></font></div><div class=""><font face="monospace" class=""><span style="white-space: pre-wrap;" class=""><br class=""></span></font></div><div class=""><font face="monospace" class=""><span style="white-space: pre-wrap;" class="">Because most “real” systems don’t have a middle button.</span></font></div></body></html>