add icon color filter range

templates/settings/admin-form.php

@@ -88,21 +88,28 @@ $choicesSizes = [
         </div>
 
         <div>
-            <label for="side-menu-opener-only">
-                <?php p($l->t('Force light icons')); ?>
+            <label for="side-menu-icon-invert-filter">
+                <?php p($l->t('Icon color')); ?>
             </label>
         </div>
 
-        <p><em>This feature is not compatible with the <code>big menu</code> display.</em></p>
-
         <div>
-            <select id="side-menu-force-light-icon" name="force-light-icon" class="side-menu-setting">
-                <?php foreach ($choicesYesNo as $label => $value): ?>
-                    <option value="<?php echo $value ?>" <?php if ($value === $_['force-light-icon']): ?>selected<?php endif; ?>>
-                        <?php echo $l->t($label);  ?>
-                    </option>
-                <?php endforeach; ?>
-            </select>
+            <em>
+                <?php p($l->t('Same color')); ?>
+            </em>
+
+            <input
+                type="range"
+                min="0" max="100"
+                id="side-menu-icon-invert-filter"
+                name="icon-invert-filter"
+                class="side-menu-setting"
+                value="<?php echo $_['icon-invert-filter'] ?>"
+            >
+
+            <em>
+                <?php p($l->t('Opposite color')); ?>
+            </em>
         </div>
 
         <div>