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    <p>This is my guess:</p> <ol> <li>the problem is related to focus grabbing;</li> <li>the window widget calls grab APIs only when the modal flag <a href="http://git.gnome.org/browse/gtk+/tree/gtk/gtkwindow.c#n2240" rel="nofollow" title="Source code of `gtk_window_set_modal()`">changes its state</a>;</li> <li>differences between platforms are mostly due to implementation details;</li> <li>you cannot have more than a single modal window.</li> </ol> <p>At the time you show <code>reused_dialog</code>, it is not clear which dialog is modal (<code>parent_window</code> is still alive).</p> <p>The right solution: I suspect if you refactor your code to show <code>reused_dialog</code> from a callback (using the <a href="http://developer.gnome.org/gtk/stable/GtkDialog.html#GtkDialog-response" rel="nofollow" title="Documentation for the GtkDialog:response signal">response</a> signal, for example), you'll get the desired result because this is the <em>usual way™</em>.</p> <p>If you don't want to refactor you could try one of these solutions/work-arounds (roughly in order of what I think is better):</p> <ul> <li><p>always disactivate the modal state of <code>reused_dialog</code> before running it; <code>gtk_dialog_run()</code> <a href="http://git.gnome.org/browse/gtk+/tree/gtk/gtkdialog.c#n1075%3a" rel="nofollow" title="Source code of `gtk_dialog_run()`">will set it</a> again, triggering what requested:</p> <pre><code>... gtk_window_set_modal(GTK_WINDOW(reused_dialog), FALSE); gtk_dialog_run(GTK_DIALOG(reused_dialog)); ... </code></pre></li> <li><p>manually grab the focus in <code>reused_dialog</code> before running it:</p> <pre><code>... gtk_grab_add(reused_dialog); gtk_dialog_run(GTK_DIALOG(reused_dialog)); ... </code></pre></li> <li><p>deactivate the modal status of the <code>parent_window</code> after run:</p> <pre><code>... gtk_dialog_run(GTK_DIALOG(parent_dialog)); gtk_window_set_modal(GTK_WINDOW(parent_dialog), FALSE); ... </code></pre></li> </ul>
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