title: Mouse thinks it is in a different tmux pane
body: <p>I am using tmux 3.0 in bash over ssh on CentOS 7. My tmux.conf is fairly simple. It has some bindings and</p>
  <pre><code>set-option -g mouse on
  set -g focus-events on
  </code></pre>
  <p>I have a fairly large tmux window with 3 vertical panes. When I move the mouse to the right side of the rightmost pane and do something (e.g. scroll with mouse wheel or click to select this pane). The action gets executed on the leftmost pane instead.</p>
  <p>This behavior persists if I detach from and reattach to the session. Any ideas what might be causing this and how to fix it?</p>