LangSelect dropdown: fixed position, unclipped by the editor panel

frontend/src/LangSelect.vue

@@ -13,10 +13,22 @@ const props = defineProps({
 const emit = defineEmits(['update:modelValue'])
 
 const open = ref(false)
+const toggleBtn = ref(null)
+const popStyle = ref({})
 const current = computed(
   () => props.options.find((o) => o.tag === props.modelValue) ?? props.options[0],
 )
 
+function toggle() {
+  open.value = !open.value
+  if (open.value) {
+    // Position: fixed so the popup overflows the scrolling editor panel
+    // onto the page area instead of being clipped by it.
+    const r = toggleBtn.value.getBoundingClientRect()
+    popStyle.value = { top: `${r.bottom + 2}px`, left: `${r.left}px` }
+  }
+}
+
 function select(tag) {
   emit('update:modelValue', tag)
   open.value = false
@@ -26,15 +38,16 @@ function select(tag) {
 <template>
   <span v-if="options.length > 1" class="lang-select">
     <button
+      ref="toggleBtn"
       type="button"
       class="lang-current"
       :class="{ open }"
       :title="title || (current
         ? `language: ${current.name}${current.primary ? ' (primary)' : ''}`
         : '')"
-      @click="open = !open"
+      @click="toggle"
     ><span v-if="current?.flag" class="flag" v-html="current.flag" /></button>
-    <span v-if="open" class="lang-pop" @mouseleave="open = false">
+    <span v-if="open" class="lang-pop" :style="popStyle" @mouseleave="open = false">
       <button
         v-for="o in options"
         :key="o.code"
@@ -69,11 +82,11 @@ function select(tag) {
   border-color: var(--line);
 }
 
-/* The dropdown matches the page's existing popups (.picker-pop look). */
+/* The dropdown matches the page's existing popups (.picker-pop look).
+   Fixed-positioned (anchored to the toggle's viewport rect on open) so it
+   is not clipped by the editor panel's scrolling overflow. */
 .lang-pop {
-  position: absolute;
+  position: fixed;
-  top: 100%;
-  left: 0;
   z-index: 20;
   display: flex;
   flex-direction: column;