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    <body><span class="vcard"><a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> <span class="fn">Peter Hutterer</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Accessibility: drag lock implementation"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85577">bug 85577</a>
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            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
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           <td style="text-align:right;">CC</td>
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           <td>peter.hutterer@who-t.net
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Accessibility: drag lock implementation"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85577#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Accessibility: drag lock implementation"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85577">bug 85577</a>
              from <span class="vcard"><a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> <span class="fn">Peter Hutterer</span></a>
</span></b>
        <pre>evdev's implementation (which dates back to the mouse driver, which dates
  back to the mists of time) has two functionalities:
  1) Button X locks button Y (usually X == Y)
  2) Button B locks the next button pressed
Googling shows a few public instances of X != Y, and a few instances of 2).
<a href="http://www.slackwiki.com/Logitech_Marble_FX_mouse">http://www.slackwiki.com/Logitech_Marble_FX_mouse</a>
<a href="http://forum.ubuntuusers.de/topic/draglockbutton-mit-logitech-trackman-marble-f/">http://forum.ubuntuusers.de/topic/draglockbutton-mit-logitech-trackman-marble-f/</a>

OS X doesn't seem to have that feature. Windows calls it ClickLock,
and has an extra setting to regulate how long the button must be held
before lock engages.
<a href="http://www.dummies.com/how-to/content/how-to-use-clicklock-in-windows-7-for-better-mouse.html">http://www.dummies.com/how-to/content/how-to-use-clicklock-in-windows-7-for-better-mouse.html</a></pre>
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