Support aborting "Pick" mode in element picker

This allows a user to go back to the previous selection after
entering interactive "Pick" mode.

src/css/epicker-ui.css

@@ -266,9 +266,6 @@ html#ublock0-epicker,
     height: 2em;
     width: 2em;
 }
-#ublock0-epicker:not(.paused) #windowbar #minimize {
-    display: none;
-}
 #windowbar #quit:hover,
 #windowbar #minimize:hover {
     background-color: var(--surface-2)

src/js/dom.js

@@ -161,9 +161,9 @@ dom.cl = class {
         }
     }
 
-    static remove(target, name) {
+    static remove(target, ...names) {
         for ( const elem of normalizeTarget(target) ) {
-            elem.classList.remove(name);
+            elem.classList.remove(...names);
         }
     }
 

src/js/epicker-ui.js

@@ -802,14 +802,16 @@ const showDialog = function(details) {
 /******************************************************************************/
 
 const pausePicker = function() {
-    pickerRoot.classList.add('paused');
+    dom.cl.add(pickerRoot, 'paused');
+    dom.cl.remove(pickerRoot, 'minimized');
     svgListening(false);
 };
 
 /******************************************************************************/
 
 const unpausePicker = function() {
-    pickerRoot.classList.remove('paused', 'preview');
+    dom.cl.remove(pickerRoot, 'paused', 'preview');
+    dom.cl.add(pickerRoot, 'minimized');
     pickerContentPort.postMessage({
         what: 'togglePreview',
         state: false,
@@ -836,7 +838,12 @@ const startPicker = function() {
     $id('create').addEventListener('click', onCreateClicked);
     $id('pick').addEventListener('click', onPickClicked);
     $id('minimize').addEventListener('click', ( ) => {
-        dom.cl.toggle(dom.html, 'minimized');
+        if ( dom.cl.has(pickerRoot, 'paused') === false ) {
+            pausePicker();
+            onCandidateChanged();
+        } else {
+            dom.cl.toggle(pickerRoot, 'minimized');
+        }
     });
     $id('quit').addEventListener('click', onQuitClicked);
     $id('move').addEventListener('mousedown', onStartMoving);