gplugin/gplugin

Add GTK4 viewer outline

2021-10-09, Elliott Sales de Andrade
d926130c6d12
Add GTK4 viewer outline

This does nothing since the widget isn't implemented, but it's setup to use GTK4 paradigms.

Testing Done:
Compile and run `gplugin-gtk4-viewer` with the various options, and some temporary debug prints.

Reviewed at https://reviews.imfreedom.org/r/992/
<?xml version="1.0" encoding="UTF-8"?>
<interface>
<requires lib="gtk" version="4.0"/>
<requires lib="gplugin-gtk" version="0.35"/>
<template class="GPluginGtkViewerWindow" parent="GtkApplicationWindow">
<property name="title" translatable="yes">GPlugin Viewer</property>
<property name="default-width">600</property>
<property name="default-height">400</property>
<child>
<object class="GtkScrolledWindow">
<property name="hscrollbar_policy">never</property>
<child>
<object class="GtkListBox">
<child type="placeholder">
<object class="GtkLabel">
<property name="label" translatable="yes">No plugins found</property>
</object>
</child>
</object>
</child>
</object>
</child>
</template>
</interface>