Setting a negative priority secretly mean "don't send me any message" which
can be very confusing.
https://bugzilla.gnome.org/show_bug.cgi?id=669712
<interface>
<requires lib="gtk+" version="2.16"/>
<object class="GtkAdjustment" id="adjustment1">
<interface>
<requires lib="gtk+" version="2.16"/>
<object class="GtkAdjustment" id="adjustment1">
- <property name="lower">-128</property>
+ <property name="lower">0</property>
<property name="upper">127</property>
<property name="step_increment">1</property>
<property name="page_increment">10</property>
<property name="upper">127</property>
<property name="step_increment">1</property>
<property name="page_increment">10</property>