Update input action prevention settings (#2104)

* Update styles for the input action prevention modal

* Add information

ext/css/settings.css

@@ -2349,6 +2349,29 @@ input[type=number].dictionary-priority {
     word-break: break-all;
 }
 
+.input-prevention-option-list {
+    margin-top: 0.375em;
+    display: flex;
+    flex-flow: column nowrap;
+    align-items: flex-start;
+    width: 100%;
+    padding-left: 0.5em;
+    box-sizing: border-box;
+}
+.input-prevention-option-list-item {
+    display: flex;
+    flex-flow: row nowrap;
+    align-items: center;
+    width: 100%;
+}
+.input-prevention-option-list-item>:first-child {
+    flex: 0 0 auto;
+}
+.input-prevention-option-list-item>:not(:first-child) {
+    margin-left: 0.375em;
+    flex: 1 1 auto;
+}
+
 
 /* Environment-specific display */
 :root[data-browser=unknown] [data-show-for-browser],

ext/settings.html

@@ -2819,21 +2819,34 @@
 <div id="input-action-prevention-modal" class="modal" tabindex="-1" role="dialog" hidden><div class="modal-content modal-content-small">
     <div class="modal-header"><div class="modal-title">Input Action Prevention</div></div>
     <div class="modal-body">
-        <strong>Prevent middle mouse button actions on:</strong>
+        <div>
-        <div class="flex-column-nowrap flex-column-nowrap-spaced margin-left">
+            Prevent middle mouse button actions on:
-            <label class="flex-label">
+            <a tabindex="0" class="more-toggle more-only" data-parent-distance="2">(?)</a>
+        </div>
+        <div class="more" hidden>
+            <p>
+                This option is used to disable the default action of the middle mouse button in different contexts.
+                This can be useful for preventing the scroll action that the middle mouse button is typically mapped to,
+                which is otherwise difficult to disable inside extension pages via other means.
+            </p>
+            <p>
+                <a tabindex="0" class="more-toggle" data-parent-distance="3">Less&hellip;</a>
+            </p>
+        </div>
+        <div class="input-prevention-option-list">
+            <label class="input-prevention-option-list-item">
                 <label class="checkbox"><input type="checkbox" data-setting="scanning.preventMiddleMouse.onWebPages"><span class="checkbox-body"><span class="checkbox-fill"></span><span class="checkbox-border"></span><span class="checkbox-check"></span></span></label>
                 <span>Webpages</span>
             </label>
-            <label class="flex-label">
+            <label class="input-prevention-option-list-item">
                 <label class="checkbox"><input type="checkbox" data-setting="scanning.preventMiddleMouse.onPopupPages"><span class="checkbox-body"><span class="checkbox-fill"></span><span class="checkbox-border"></span><span class="checkbox-check"></span></span></label>
                 <span>Popups</span>
             </label>
-            <label class="flex-label">
+            <label class="input-prevention-option-list-item">
                 <label class="checkbox"><input type="checkbox" data-setting="scanning.preventMiddleMouse.onSearchPages"><span class="checkbox-body"><span class="checkbox-fill"></span><span class="checkbox-border"></span><span class="checkbox-check"></span></span></label>
                 <span>Search page</span>
             </label>
-            <label class="flex-label">
+            <label class="input-prevention-option-list-item">
                 <label class="checkbox"><input type="checkbox" data-setting="scanning.preventMiddleMouse.onSearchQuery"><span class="checkbox-body"><span class="checkbox-fill"></span><span class="checkbox-border"></span><span class="checkbox-check"></span></span></label>
                 <span>Search query</span>
             </label>