Background Button: Ship open icon

src/data/icons/open-symbolic.svg

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+SPDX-FileCopyrightText: Jakub Steiner
+SPDX-License-Identifier: CC0-1.0
+-->
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:ns0="http://www.w3.org/2000/svg" xmlns:ns1="https://www.gtk.org/grappa" xmlns:ns3="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" ns1:rendering="symbolic" ns1:version="1" ns1:state="outline" ns1:state-names="outline empty" viewBox="0 0 16 16" preserveAspectRatio="xMidYMid meet" gpa:state="outline" ns0:state="outline" xmlns="http://www.w3.org/2000/svg">
+  <title>document-open</title>
+  <path d="M 4 11 L 5.47399998 8.05200005 C 5.79666519 7.40714836, 6.4559269 6.99990034, 7.17700005 7 L 13.2370005 7 C 13.8192186 6.99966431, 14.3634796 7.28890514, 14.6889772 7.77163696 C 15.0144749 8.25436878, 15.0785809 8.86736965, 14.8599997 9.40699959 L 13.4099998 12.9899998 C 13.1625767 13.600914, 12.5691166 14.0005112, 11.9099998 14 L 2.79999995 14 C 1.80588734 14, 0.999999821 13.1941128, 1 12.1999998 L 1 4.26599979 C 1.00000012 3.01452255, 2.01452279 2, 3.26600003 2 L 6 2 L 8 4 L 11 4 C 12.1045694 4, 13 4.89543056, 13 6 L 13 7" id="path0" stroke-width="1.100" stroke-linecap="round" stroke-linejoin="round" stroke="rgb(0,0,0)" fill="none" class="foreground-stroke transparent-fill foreground-stroke" ns1:states="outline" ns1:stroke-minwidth="25%" ns1:stroke-maxwidth="150%" data-stroke-mid="2.0" data-stroke-min="0.5" data-stroke-max="3.0" style="--darkreader-inline-stroke: var(--darkreader-text-000000, #e8e6e3);" data-darkreader-inline-stroke=""></path>
+  <metadata>
+    <rdf:rdf>
+      <work>
+        <license rdf:resource="https://creativecommons.org/publicdomain/zero/1.0/"/>
+        <dc:subject>
+          <rdf:bag>
+            <rdf:li>folder-open document document-open folder-drag-accept</rdf:li>
+          </rdf:bag>
+        </dc:subject>
+        <dc:creator>
+          <agent>
+            <dc:title>Jakub Steiner</dc:title>
+          </agent>
+        </dc:creator>
+      </work>
+    </rdf:rdf>
+  </metadata>
+</svg>

src/data/preferences.gresource.xml

@@ -9,6 +9,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
     <file compressed="true" preprocess="xml-stripblanks">assets/preview-window-light.svg</file>
     <file compressed="true" preprocess="xml-stripblanks" alias="icons/scalable/actions/nightthemeswitcher-add-symbolic.svg">icons/add-symbolic.svg</file>
     <file compressed="true" preprocess="xml-stripblanks" alias="icons/scalable/actions/nightthemeswitcher-code-symbolic.svg">icons/code-symbolic.svg</file>
+    <file compressed="true" preprocess="xml-stripblanks" alias="icons/scalable/actions/nightthemeswitcher-open-symbolic.svg">icons/open-symbolic.svg</file>
     <file compressed="true" preprocess="xml-stripblanks" alias="icons/scalable/actions/nightthemeswitcher-translate-symbolic.svg">icons/translate-symbolic.svg</file>
     <file compressed="true" preprocess="xml-stripblanks" alias="icons/scalable/actions/nightthemeswitcher-trash-symbolic.svg">icons/trash-symbolic.svg</file>
     <file compressed="true" preprocess="xml-stripblanks" alias="icons/scalable/apps/nightthemeswitcher-symbolic.svg">icons/nightthemeswitcher-symbolic.svg</file>

src/data/ui/BackgroundButton.ui

@@ -12,7 +12,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
     <property name="tooltip-text" translatable="yes">Change background</property>
     <property name="child">
       <object class="AdwButtonContent">
-        <property name="icon-name">document-open-symbolic</property>
+        <property name="icon-name">nightthemeswitcher-open-symbolic</property>
         <property name="can-shrink">True</property>
         <binding name="label">
           <closure type="gchararray" function="_getBackgroundFileName">