Add SVG icons for customize buffers

* etc/images/checkbox-mixed.svg:
* etc/images/checked.svg:
* etc/images/down.svg:
* etc/images/left.svg:
* etc/images/radio-checked.svg:
* etc/images/radio-mixed.svg:
* etc/images/radio.svg:
* etc/images/right.svg:
* etc/images/unchecked.svg:
* etc/images/up.svg: New files from the Adwaita Icon Theme (made by
the GNOME project).  The background color was changed from gray to
none to use the same colors as the current face instead.  (Bug#47074)
* etc/images/README: Add license information for the above new files.
* lisp/wid-edit.el (widget-image-conversion): Prefer SVG if it exists.
(radio-button): Rename radio buttons to "radio-checked" and
"radio".  These files did not exist before.

11 files changed, 217 insertions, 0 deletions

diff --git a/etc/images/README b/etc/images/README
index 00aac4f510a..9bbe796cc95 100644
--- a/etc/images/README
+++ b/etc/images/README
@@ -104,3 +104,30 @@ same conditions.
 
 The *.pbm files were generally converted from *.xpm by running GIMP or
 ImageMagick's 'convert'.
+
+
+* The following icons are from the Adwaita Icon Theme (made by the
+GNOME project).  They are not part of Emacs, but are distributed and
+used by Emacs.  They are licensed under either the GNU LGPL v3 or the
+Creative Commons Attribution-Share Alike 3.0 United States License.
+
+To view a copy of the CC-BY-SA licence, visit
+http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative
+Commons, 171 Second Street, Suite 300, San Francisco, California 94105, USA.
+
+For more information see the adwaita-icon-theme repository at:
+
+    https://gitlab.gnome.org/GNOME/adwaita-icon-theme
+
+Emacs images and their source in the Adwaita/scalable directory:
+
+  checked.svg               ui/checkbox-checked-symbolic.svg
+  unchecked.svg             ui/checkbox-symbolic.svg
+  checkbox-mixed.svg        ui/checkbox-mixed-symbolic.svg
+  radio.svg                 ui/radio-symbolic.svg
+  radio-mixed.svg           ui/radio-mixed-symbolic.svg
+  radio-checked.svg         ui/radio-checked-symbolic.svg
+  down.svg                  ui/pan-down-symbolic.svg
+  left.svg                  ui/pan-start-symbolic.svg
+  right.svg                 ui/pan-end-symbolic.svg
+  up.svg                    ui/pan-up-symbolic.svg
diff --git a/etc/images/checkbox-mixed.svg b/etc/images/checkbox-mixed.svg
new file mode 100644
index 00000000000..13bccaa7ce1
--- /dev/null
+++ b/etc/images/checkbox-mixed.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16">
+  <g>
+    <path d="M3.5 1A2.506 2.506 0 001 3.5v9C1 13.876 2.124 15 3.5 15h9c1.376 0 2.5-1.124 2.5-2.5v-9C15 2.124 13.876 1 12.5 1zm0 1h9c.84 0 1.5.66 1.5 1.5v9c0 .84-.66 1.5-1.5 1.5h-9c-.84 0-1.5-.66-1.5-1.5v-9C2 2.66 2.66 2 3.5 2z" overflow="visible" />
+    <path d="M5 6a2 2 0 100 4h6a2 2 0 100-4z" overflow="visible" />
+  </g>
+</svg>
diff --git a/etc/images/checked.svg b/etc/images/checked.svg
new file mode 100644
index 00000000000..6fefd5569ef
--- /dev/null
+++ b/etc/images/checked.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16">
+  <g>
+    <path d="M3.5 1A2.506 2.506 0 001 3.5v9C1 13.876 2.124 15 3.5 15h9c1.376 0 2.5-1.124 2.5-2.5v-9C15 2.124 13.876 1 12.5 1zm0 1h9c.84 0 1.5.66 1.5 1.5v9c0 .84-.66 1.5-1.5 1.5h-9c-.84 0-1.5-.66-1.5-1.5v-9C2 2.66 2.66 2 3.5 2z" overflow="visible" />
+    <path d="M14.5 3l-.5-.5L7.5 9 5 6.5l-2 2L7.5 13l7-7z" overflow="visible" />
+  </g>
+</svg>
diff --git a/etc/images/down.svg b/etc/images/down.svg
new file mode 100644
index 00000000000..e2760427d73
--- /dev/null
+++ b/etc/images/down.svg
@@ -0,0 +1,40 @@
+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<svg xmlns:cc='http://creativecommons.org/ns#' xmlns:dc='http://purl.org/dc/elements/1.1/' sodipodi:docname='pan-down-symbolic.svg' inkscape:export-filename='/home/sam/source-symbolic.png' inkscape:export-xdpi='270' inkscape:export-ydpi='270' height='16' id='svg7384' xmlns:inkscape='http://www.inkscape.org/namespaces/inkscape' xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:sodipodi='http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd' style='enable-background:new' xmlns:svg='http://www.w3.org/2000/svg' version='1.1' inkscape:version='1.0 (4035a4fb49, 2020-05-01)' width='16' xmlns='http://www.w3.org/2000/svg'>
+  <sodipodi:namedview inkscape:bbox-nodes='true' inkscape:bbox-paths='false' bordercolor='#000000' borderlayer='false' borderopacity='0.50196078' inkscape:current-layer='layer10' inkscape:cx='-8.85234' inkscape:cy='7.9624984' inkscape:document-rotation='0' gridtolerance='10' inkscape:guide-bbox='true' guidetolerance='10' id='namedview88' inkscape:measure-end='0,0' inkscape:measure-start='0,0' inkscape:object-nodes='true' inkscape:object-paths='true' objecttolerance='10' pagecolor='#e2e2e2' inkscape:pageopacity='0' inkscape:pageshadow='2' showborder='false' showgrid='true' showguides='false' inkscape:showpageshadow='false' inkscape:snap-bbox='true' inkscape:snap-bbox-edge-midpoints='false' inkscape:snap-bbox-midpoints='true' inkscape:snap-center='false' inkscape:snap-global='true' inkscape:snap-grids='true' inkscape:snap-intersection-paths='false' inkscape:snap-midpoints='true' inkscape:snap-nodes='true' inkscape:snap-object-midpoints='true' inkscape:snap-others='true' inkscape:snap-page='false' inkscape:snap-smooth-nodes='true' inkscape:snap-to-guides='true' inkscape:window-height='1205' inkscape:window-maximized='0' inkscape:window-width='1553' inkscape:window-x='26' inkscape:window-y='23' inkscape:zoom='1'>
+    <inkscape:grid color='#000000' dotted='false' empcolor='#0800ff' empopacity='0.4627451' empspacing='4' enabled='true' id='grid4866' opacity='0.16470588' originx='-152.00586' originy='-952' snapvisiblegridlinesonly='true' spacingx='1' spacingy='1' type='xygrid' visible='true'/>
+    <inkscape:grid dotted='true' empcolor='#3f3fff' empopacity='0' empspacing='4' id='grid3540' originx='-152.00586' originy='-952' spacingx='0.5' spacingy='0.5' type='xygrid'/>
+  </sodipodi:namedview>
+  <metadata id='metadata90'>
+    <rdf:RDF>
+      <cc:Work rdf:about=''>
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/>
+        <dc:title>Gnome Symbolic Icons</dc:title>
+        <cc:license rdf:resource='http://creativecommons.org/licenses/by-sa/4.0/'/>
+      </cc:Work>
+      <cc:License rdf:about='http://creativecommons.org/licenses/by-sa/4.0/'>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Reproduction'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Distribution'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Notice'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Attribution'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#DerivativeWorks'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#ShareAlike'/>
+      </cc:License>
+    </rdf:RDF>
+  </metadata>
+  <title id='title8473'>Gnome Symbolic Icons</title>
+  <defs id='defs7386'/>
+  <g inkscape:groupmode='layer' id='layer10' inkscape:label='ui' transform='translate(-152.00586,-952)'>
+    <path inkscape:connector-curvature='0' d='m 166,957 -5.99414,5.99999 L 154,957 Z' id='path6424' sodipodi:nodetypes='cccc' style='fill:#2e3436;fill-opacity:1;stroke:none'/>
+  </g>
+  <g inkscape:groupmode='layer' id='layer1' inkscape:label='status' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer11' inkscape:label='legacy' transform='translate(-152.00586,-952)'/>
+  <g inkscape:groupmode='layer' id='layer7' inkscape:label='places' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer6' inkscape:label='mimetypes' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer5' inkscape:label='emotes' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer9' inkscape:label='emblems' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer2' inkscape:label='devices' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer8' inkscape:label='categories' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer3' inkscape:label='apps' transform='translate(-152.00586,-888)'/>
+  <g inkscape:groupmode='layer' id='layer4' inkscape:label='actions' transform='translate(-152.00586,-888)'/>
+</svg>
diff --git a/etc/images/left.svg b/etc/images/left.svg
new file mode 100644
index 00000000000..d6429bc4109
--- /dev/null
+++ b/etc/images/left.svg
@@ -0,0 +1,40 @@
+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<svg xmlns:cc='http://creativecommons.org/ns#' xmlns:dc='http://purl.org/dc/elements/1.1/' sodipodi:docname='pan-start-symbolic.svg' inkscape:export-filename='/home/sam/source-symbolic.png' inkscape:export-xdpi='270' inkscape:export-ydpi='270' height='16' id='svg7384' xmlns:inkscape='http://www.inkscape.org/namespaces/inkscape' xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:sodipodi='http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd' style='enable-background:new' xmlns:svg='http://www.w3.org/2000/svg' version='1.1' inkscape:version='1.0 (4035a4fb49, 2020-05-01)' width='16' xmlns='http://www.w3.org/2000/svg'>
+  <sodipodi:namedview inkscape:bbox-nodes='true' inkscape:bbox-paths='false' bordercolor='#000000' borderlayer='false' borderopacity='0.50196078' inkscape:current-layer='layer10' inkscape:cx='51.147672' inkscape:cy='7.96251' inkscape:document-rotation='0' gridtolerance='10' inkscape:guide-bbox='true' guidetolerance='10' id='namedview88' inkscape:measure-end='0,0' inkscape:measure-start='0,0' inkscape:object-nodes='true' inkscape:object-paths='true' objecttolerance='10' pagecolor='#e2e2e2' inkscape:pageopacity='0' inkscape:pageshadow='2' showborder='false' showgrid='true' showguides='false' inkscape:showpageshadow='false' inkscape:snap-bbox='true' inkscape:snap-bbox-edge-midpoints='false' inkscape:snap-bbox-midpoints='true' inkscape:snap-center='false' inkscape:snap-global='true' inkscape:snap-grids='true' inkscape:snap-intersection-paths='false' inkscape:snap-midpoints='true' inkscape:snap-nodes='true' inkscape:snap-object-midpoints='true' inkscape:snap-others='true' inkscape:snap-page='false' inkscape:snap-smooth-nodes='true' inkscape:snap-to-guides='true' inkscape:window-height='1205' inkscape:window-maximized='0' inkscape:window-width='1553' inkscape:window-x='26' inkscape:window-y='23' inkscape:zoom='1'>
+    <inkscape:grid color='#000000' dotted='false' empcolor='#0800ff' empopacity='0.4627451' empspacing='4' enabled='true' id='grid4866' opacity='0.16470588' originx='-92.005848' originy='-951.99999' snapvisiblegridlinesonly='true' spacingx='1' spacingy='1' type='xygrid' visible='true'/>
+    <inkscape:grid dotted='true' empcolor='#3f3fff' empopacity='0' empspacing='4' id='grid3540' originx='-92.005848' originy='-951.99999' spacingx='0.5' spacingy='0.5' type='xygrid'/>
+  </sodipodi:namedview>
+  <metadata id='metadata90'>
+    <rdf:RDF>
+      <cc:Work rdf:about=''>
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/>
+        <dc:title>Gnome Symbolic Icons</dc:title>
+        <cc:license rdf:resource='http://creativecommons.org/licenses/by-sa/4.0/'/>
+      </cc:Work>
+      <cc:License rdf:about='http://creativecommons.org/licenses/by-sa/4.0/'>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Reproduction'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Distribution'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Notice'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Attribution'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#DerivativeWorks'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#ShareAlike'/>
+      </cc:License>
+    </rdf:RDF>
+  </metadata>
+  <title id='title8473'>Gnome Symbolic Icons</title>
+  <defs id='defs7386'/>
+  <g inkscape:groupmode='layer' id='layer10' inkscape:label='ui' transform='translate(-92.005848,-951.99999)'>
+    <path inkscape:connector-curvature='0' d='M 103,966 97.00585,959.99999 103,954 Z' id='path6400' sodipodi:nodetypes='cccc' style='fill:#2e3436;fill-opacity:1;stroke:none'/>
+  </g>
+  <g inkscape:groupmode='layer' id='layer1' inkscape:label='status' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer11' inkscape:label='legacy' transform='translate(-92.005848,-951.99999)'/>
+  <g inkscape:groupmode='layer' id='layer7' inkscape:label='places' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer6' inkscape:label='mimetypes' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer5' inkscape:label='emotes' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer9' inkscape:label='emblems' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer2' inkscape:label='devices' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer8' inkscape:label='categories' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer3' inkscape:label='apps' transform='translate(-92.005848,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer4' inkscape:label='actions' transform='translate(-92.005848,-887.99999)'/>
+</svg>
diff --git a/etc/images/radio-checked.svg b/etc/images/radio-checked.svg
new file mode 100644
index 00000000000..db711841cf0
--- /dev/null
+++ b/etc/images/radio-checked.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16">
+  <g>
+    <path d="M8 5a3.001 3.001 0 000 6 3.001 3.001 0 000-6z" overflow="visible"/>
+    <path d="M8.004 1C4.144 1 1 4.144 1 8.004c0 3.86 3.144 7.006 7.004 7.006 3.86 0 7.006-3.146 7.006-7.006C15.01 4.144 11.864 1 8.004 1zm0 1a6.002 6.002 0 016.006 6.004 6.004 6.004 0 01-6.006 6.006A6.002 6.002 0 012 8.004 6 6 0 018.004 2z" overflow="visible"/>
+  </g>
+</svg>
diff --git a/etc/images/radio-mixed.svg b/etc/images/radio-mixed.svg
new file mode 100644
index 00000000000..5a8be0cf657
--- /dev/null
+++ b/etc/images/radio-mixed.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16">
+  <g font-weight="400" fill="#474747">
+    <path d="M8 1C4.142 1 1 4.142 1 8s3.142 7 7 7 7-3.142 7-7-3.142-7-7-7zm0 1c3.316 0 6 2.684 6 6s-2.684 6-6 6-6-2.684-6-6 2.684-6 6-6z" overflow="visible" />
+    <path d="M5 6a2 2 0 100 4h6a2 2 0 100-4z" overflow="visible" />
+  </g>
+</svg>
diff --git a/etc/images/radio.svg b/etc/images/radio.svg
new file mode 100644
index 00000000000..0d649c99cd4
--- /dev/null
+++ b/etc/images/radio.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16">
+  <path d="M8 1C4.142 1 1 4.142 1 8s3.142 7 7 7 7-3.142 7-7-3.142-7-7-7zm0 1c3.316 0 6 2.684 6 6s-2.684 6-6 6-6-2.684-6-6 2.684-6 6-6z" overflow="visible" />
+</svg>
diff --git a/etc/images/right.svg b/etc/images/right.svg
new file mode 100644
index 00000000000..d58cd364359
--- /dev/null
+++ b/etc/images/right.svg
@@ -0,0 +1,40 @@
+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<svg xmlns:cc='http://creativecommons.org/ns#' xmlns:dc='http://purl.org/dc/elements/1.1/' sodipodi:docname='pan-end-symbolic.svg' inkscape:export-filename='/home/sam/source-symbolic.png' inkscape:export-xdpi='270' inkscape:export-ydpi='270' height='16' id='svg7384' xmlns:inkscape='http://www.inkscape.org/namespaces/inkscape' xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:sodipodi='http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd' style='enable-background:new' xmlns:svg='http://www.w3.org/2000/svg' version='1.1' inkscape:version='1.0 (4035a4fb49, 2020-05-01)' width='16' xmlns='http://www.w3.org/2000/svg'>
+  <sodipodi:namedview inkscape:bbox-nodes='true' inkscape:bbox-paths='false' bordercolor='#000000' borderlayer='false' borderopacity='0.50196078' inkscape:current-layer='layer10' inkscape:cx='31.147668' inkscape:cy='7.96251' inkscape:document-rotation='0' gridtolerance='10' inkscape:guide-bbox='true' guidetolerance='10' id='namedview88' inkscape:measure-end='0,0' inkscape:measure-start='0,0' inkscape:object-nodes='true' inkscape:object-paths='true' objecttolerance='10' pagecolor='#e2e2e2' inkscape:pageopacity='0' inkscape:pageshadow='2' showborder='false' showgrid='true' showguides='false' inkscape:showpageshadow='false' inkscape:snap-bbox='true' inkscape:snap-bbox-edge-midpoints='false' inkscape:snap-bbox-midpoints='true' inkscape:snap-center='false' inkscape:snap-global='true' inkscape:snap-grids='true' inkscape:snap-intersection-paths='false' inkscape:snap-midpoints='true' inkscape:snap-nodes='true' inkscape:snap-object-midpoints='true' inkscape:snap-others='true' inkscape:snap-page='false' inkscape:snap-smooth-nodes='true' inkscape:snap-to-guides='true' inkscape:window-height='1205' inkscape:window-maximized='0' inkscape:window-width='1553' inkscape:window-x='26' inkscape:window-y='23' inkscape:zoom='1'>
+    <inkscape:grid color='#000000' dotted='false' empcolor='#0800ff' empopacity='0.4627451' empspacing='4' enabled='true' id='grid4866' opacity='0.16470588' originx='-112.00585' originy='-951.99999' snapvisiblegridlinesonly='true' spacingx='1' spacingy='1' type='xygrid' visible='true'/>
+    <inkscape:grid dotted='true' empcolor='#3f3fff' empopacity='0' empspacing='4' id='grid3540' originx='-112.00585' originy='-951.99999' spacingx='0.5' spacingy='0.5' type='xygrid'/>
+  </sodipodi:namedview>
+  <metadata id='metadata90'>
+    <rdf:RDF>
+      <cc:Work rdf:about=''>
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/>
+        <dc:title>Gnome Symbolic Icons</dc:title>
+        <cc:license rdf:resource='http://creativecommons.org/licenses/by-sa/4.0/'/>
+      </cc:Work>
+      <cc:License rdf:about='http://creativecommons.org/licenses/by-sa/4.0/'>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Reproduction'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Distribution'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Notice'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Attribution'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#DerivativeWorks'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#ShareAlike'/>
+      </cc:License>
+    </rdf:RDF>
+  </metadata>
+  <title id='title8473'>Gnome Symbolic Icons</title>
+  <defs id='defs7386'/>
+  <g inkscape:groupmode='layer' id='layer10' inkscape:label='ui' transform='translate(-112.00585,-951.99999)'>
+    <path inkscape:connector-curvature='0' d='m 117,966 6.00585,-6.00001 L 117,954 Z' id='path6412' sodipodi:nodetypes='cccc' style='fill:#2e3436;fill-opacity:1;stroke:none'/>
+  </g>
+  <g inkscape:groupmode='layer' id='layer1' inkscape:label='status' transform='translate(-112.00585,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer11' inkscape:label='legacy' transform='translate(-112.00585,-951.99999)'/>
+  <g inkscape:groupmode='layer' id='layer7' inkscape:label='places' transform='translate(-112.00585,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer6' inkscape:label='mimetypes' transform='translate(-112.00585,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer5' inkscape:label='emotes' transform='translate(-112.00585,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer9' inkscape:label='emblems' transform='translate(-112.00585,-887.99999)'/>
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+  <g inkscape:groupmode='layer' id='layer8' inkscape:label='categories' transform='translate(-112.00585,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer3' inkscape:label='apps' transform='translate(-112.00585,-887.99999)'/>
+  <g inkscape:groupmode='layer' id='layer4' inkscape:label='actions' transform='translate(-112.00585,-887.99999)'/>
+</svg>
diff --git a/etc/images/unchecked.svg b/etc/images/unchecked.svg
new file mode 100644
index 00000000000..18cd25b43fd
--- /dev/null
+++ b/etc/images/unchecked.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16">
+  <path d="M3.5 1A2.506 2.506 0 001 3.5v9C1 13.876 2.124 15 3.5 15h9c1.376 0 2.5-1.124 2.5-2.5v-9C15 2.124 13.876 1 12.5 1zm0 1h9c.84 0 1.5.66 1.5 1.5v9c0 .84-.66 1.5-1.5 1.5h-9c-.84 0-1.5-.66-1.5-1.5v-9C2 2.66 2.66 2 3.5 2z" overflow="visible" />
+</svg>
diff --git a/etc/images/up.svg b/etc/images/up.svg
new file mode 100644
index 00000000000..9e1a245be74
--- /dev/null
+++ b/etc/images/up.svg
@@ -0,0 +1,40 @@
+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<svg xmlns:cc='http://creativecommons.org/ns#' xmlns:dc='http://purl.org/dc/elements/1.1/' sodipodi:docname='pan-up-symbolic.svg' inkscape:export-filename='/home/sam/source-symbolic.png' inkscape:export-xdpi='270' inkscape:export-ydpi='270' height='16' id='svg7384' xmlns:inkscape='http://www.inkscape.org/namespaces/inkscape' xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:sodipodi='http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd' style='enable-background:new' xmlns:svg='http://www.w3.org/2000/svg' version='1.1' inkscape:version='1.0 (4035a4fb49, 2020-05-01)' width='16' xmlns='http://www.w3.org/2000/svg'>
+  <sodipodi:namedview inkscape:bbox-nodes='true' inkscape:bbox-paths='false' bordercolor='#000000' borderlayer='false' borderopacity='0.50196078' inkscape:current-layer='layer10' inkscape:cx='11.14767' inkscape:cy='7.9625016' inkscape:document-rotation='0' gridtolerance='10' inkscape:guide-bbox='true' guidetolerance='10' id='namedview88' inkscape:measure-end='0,0' inkscape:measure-start='0,0' inkscape:object-nodes='true' inkscape:object-paths='true' objecttolerance='10' pagecolor='#e2e2e2' inkscape:pageopacity='0' inkscape:pageshadow='2' showborder='false' showgrid='true' showguides='false' inkscape:showpageshadow='false' inkscape:snap-bbox='true' inkscape:snap-bbox-edge-midpoints='false' inkscape:snap-bbox-midpoints='true' inkscape:snap-center='false' inkscape:snap-global='true' inkscape:snap-grids='true' inkscape:snap-intersection-paths='false' inkscape:snap-midpoints='true' inkscape:snap-nodes='true' inkscape:snap-object-midpoints='true' inkscape:snap-others='true' inkscape:snap-page='false' inkscape:snap-smooth-nodes='true' inkscape:snap-to-guides='true' inkscape:window-height='1205' inkscape:window-maximized='0' inkscape:window-width='1553' inkscape:window-x='26' inkscape:window-y='23' inkscape:zoom='1'>
+    <inkscape:grid color='#000000' dotted='false' empcolor='#0800ff' empopacity='0.4627451' empspacing='4' enabled='true' id='grid4866' opacity='0.16470588' originx='-132.00585' originy='-952' snapvisiblegridlinesonly='true' spacingx='1' spacingy='1' type='xygrid' visible='true'/>
+    <inkscape:grid dotted='true' empcolor='#3f3fff' empopacity='0' empspacing='4' id='grid3540' originx='-132.00585' originy='-952' spacingx='0.5' spacingy='0.5' type='xygrid'/>
+  </sodipodi:namedview>
+  <metadata id='metadata90'>
+    <rdf:RDF>
+      <cc:Work rdf:about=''>
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/>
+        <dc:title>Gnome Symbolic Icons</dc:title>
+        <cc:license rdf:resource='http://creativecommons.org/licenses/by-sa/4.0/'/>
+      </cc:Work>
+      <cc:License rdf:about='http://creativecommons.org/licenses/by-sa/4.0/'>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Reproduction'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#Distribution'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Notice'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#Attribution'/>
+        <cc:permits rdf:resource='http://creativecommons.org/ns#DerivativeWorks'/>
+        <cc:requires rdf:resource='http://creativecommons.org/ns#ShareAlike'/>
+      </cc:License>
+    </rdf:RDF>
+  </metadata>
+  <title id='title8473'>Gnome Symbolic Icons</title>
+  <defs id='defs7386'/>
+  <g inkscape:groupmode='layer' id='layer10' inkscape:label='ui' transform='translate(-132.00585,-952)'>
+    <path inkscape:connector-curvature='0' d='M 146,963 140.00585,956.99999 134,963 Z' id='path6418' sodipodi:nodetypes='cccc' style='fill:#2e3436;fill-opacity:1;stroke:none'/>
+  </g>
+  <g inkscape:groupmode='layer' id='layer1' inkscape:label='status' transform='translate(-132.00585,-888)'/>
+  <g inkscape:groupmode='layer' id='layer11' inkscape:label='legacy' transform='translate(-132.00585,-952)'/>
+  <g inkscape:groupmode='layer' id='layer7' inkscape:label='places' transform='translate(-132.00585,-888)'/>
+  <g inkscape:groupmode='layer' id='layer6' inkscape:label='mimetypes' transform='translate(-132.00585,-888)'/>
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+  <g inkscape:groupmode='layer' id='layer9' inkscape:label='emblems' transform='translate(-132.00585,-888)'/>
+  <g inkscape:groupmode='layer' id='layer2' inkscape:label='devices' transform='translate(-132.00585,-888)'/>
+  <g inkscape:groupmode='layer' id='layer8' inkscape:label='categories' transform='translate(-132.00585,-888)'/>
+  <g inkscape:groupmode='layer' id='layer3' inkscape:label='apps' transform='translate(-132.00585,-888)'/>
+  <g inkscape:groupmode='layer' id='layer4' inkscape:label='actions' transform='translate(-132.00585,-888)'/>
+</svg>