<p>The split window is best treated as a read-only view, its does not provide full editing capability.  Geany is designed knowing about only one edit window, a plugin may add another editing window, but cannot change the design of Geany.  So operations that are part of the editing widget work, since it <em>is</em> the extra window, those operations that are part of Geany do not work since Geany is not written to handle extra edit windows.</p>
<p>There have been several attempts to fix this over the years, but they were either very large changes, or had poor performance (<a class="user-mention" data-hovercard-user-id="793526" href="https://github.com/b4n">@b4n</a> has GTK3 speed improved for your window switch hack yet?) or were otherwise unacceptable.</p>

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