Merge remote-tracking branch 'origin/develop' into expert-settings-and-serverside

* origin/develop: (83 commits)
  Make media modal buttons larger
  Add English translation for hide tooltip
  Add hide button to media modal
  Lint
  Prevent hiding media viewer if swiped over SwipeClick
  Fix webkit image blurs
  Fix video in media modal not displaying properly
  Add changelog for https://git.pleroma.social/pleroma/pleroma-fe/-/merge_requests/1403
  Remove image box-shadow in media modal
  Clean up debug code for image pinch zoom
  Bump @kazvmoe-infra/pinch-zoom-element to 1.2.0 on npm
  Bump pinch-zoom-element version
  Clean up
  Check whether we swiped only for mouse pointer
  Scale swipe threshold with viewport width
  Update pinch-zoom-element
  Allow pinch-zoom to fill the whole screen
  Use native click for hiding overlay
  Reset position on swipe end even if we cannot navigate
  Make lint happy
  ...

2 files changed, 586 insertions, 35 deletions

diff --git a/src/components/conversation/conversation.js b/src/components/conversation/conversation.js
index 069c0b40..2ef2977a 100644
--- a/src/components/conversation/conversation.js
+++ b/src/components/conversation/conversation.js
@@ -1,5 +1,19 @@
 import { reduce, filter, findIndex, clone, get } from 'lodash'
 import Status from '../status/status.vue'
+import ThreadTree from '../thread_tree/thread_tree.vue'
+
+import { library } from '@fortawesome/fontawesome-svg-core'
+import {
+  faAngleDoubleDown,
+  faAngleDoubleLeft,
+  faChevronLeft
+} from '@fortawesome/free-solid-svg-icons'
+
+library.add(
+  faAngleDoubleDown,
+  faAngleDoubleLeft,
+  faChevronLeft
+)
 
 const sortById = (a, b) => {
   const idA = a.type === 'retweet' ? a.retweeted_status.id : a.id
@@ -35,7 +49,10 @@ const conversation = {
   data () {
     return {
       highlight: null,
-      expanded: false
+      expanded: false,
+      threadDisplayStatusObject: {}, // id => 'showing' | 'hidden'
+      statusContentPropertiesObject: {},
+      inlineDivePosition: null
     }
   },
   props: [
@@ -53,13 +70,51 @@ const conversation = {
     }
   },
   computed: {
-    hideStatus () {
+    maxDepthToShowByDefault () {
+      // maxDepthInThread = max number of depths that is *visible*
+      // since our depth starts with 0 and "showing" means "showing children"
+      // there is a -2 here
+      const maxDepth = this.$store.getters.mergedConfig.maxDepthInThread - 2
+      return maxDepth >= 1 ? maxDepth : 1
+    },
+    displayStyle () {
+      return this.$store.getters.mergedConfig.conversationDisplay
+    },
+    isTreeView () {
+      return !this.isLinearView
+    },
+    treeViewIsSimple () {
+      return !this.$store.getters.mergedConfig.conversationTreeAdvanced
+    },
+    isLinearView () {
+      return this.displayStyle === 'linear'
+    },
+    shouldFadeAncestors () {
+      return this.$store.getters.mergedConfig.conversationTreeFadeAncestors
+    },
+    otherRepliesButtonPosition () {
+      return this.$store.getters.mergedConfig.conversationOtherRepliesButton
+    },
+    showOtherRepliesButtonBelowStatus () {
+      return this.otherRepliesButtonPosition === 'below'
+    },
+    showOtherRepliesButtonInsideStatus () {
+      return this.otherRepliesButtonPosition === 'inside'
+    },
+    suspendable () {
+      if (this.isTreeView) {
+        return Object.entries(this.statusContentProperties)
+          .every(([k, prop]) => !prop.replying && prop.mediaPlaying.length === 0)
+      }
       if (this.$refs.statusComponent && this.$refs.statusComponent[0]) {
-        return this.virtualHidden && this.$refs.statusComponent[0].suspendable
+        return this.$refs.statusComponent.every(s => s.suspendable)
       } else {
-        return this.virtualHidden
+        return true
       }
     },
+    hideStatus () {
+      return this.virtualHidden && this.suspendable
+    },
     status () {
       return this.$store.state.statuses.allStatusesObject[this.statusId]
     },
@@ -90,6 +145,121 @@ const conversation = {
 
       return sortAndFilterConversation(conversation, this.status)
     },
+    statusMap () {
+      return this.conversation.reduce((res, s) => {
+        res[s.id] = s
+        return res
+      }, {})
+    },
+    threadTree () {
+      const reverseLookupTable = this.conversation.reduce((table, status, index) => {
+        table[status.id] = index
+        return table
+      }, {})
+
+      const threads = this.conversation.reduce((a, cur) => {
+        const id = cur.id
+        a.forest[id] = this.getReplies(id)
+          .map(s => s.id)
+
+        return a
+      }, {
+        forest: {}
+      })
+
+      const walk = (forest, topLevel, depth = 0, processed = {}) => topLevel.map(id => {
+        if (processed[id]) {
+          return []
+        }
+
+        processed[id] = true
+        return [{
+          status: this.conversation[reverseLookupTable[id]],
+          id,
+          depth
+        }, walk(forest, forest[id], depth + 1, processed)].reduce((a, b) => a.concat(b), [])
+      }).reduce((a, b) => a.concat(b), [])
+
+      const linearized = walk(threads.forest, this.topLevel.map(k => k.id))
+
+      return linearized
+    },
+    replyIds () {
+      return this.conversation.map(k => k.id)
+        .reduce((res, id) => {
+          res[id] = (this.replies[id] || []).map(k => k.id)
+          return res
+        }, {})
+    },
+    totalReplyCount () {
+      const sizes = {}
+      const subTreeSizeFor = (id) => {
+        if (sizes[id]) {
+          return sizes[id]
+        }
+        sizes[id] = 1 + this.replyIds[id].map(cid => subTreeSizeFor(cid)).reduce((a, b) => a + b, 0)
+        return sizes[id]
+      }
+      this.conversation.map(k => k.id).map(subTreeSizeFor)
+      return Object.keys(sizes).reduce((res, id) => {
+        res[id] = sizes[id] - 1 // exclude itself
+        return res
+      }, {})
+    },
+    totalReplyDepth () {
+      const depths = {}
+      const subTreeDepthFor = (id) => {
+        if (depths[id]) {
+          return depths[id]
+        }
+        depths[id] = 1 + this.replyIds[id].map(cid => subTreeDepthFor(cid)).reduce((a, b) => a > b ? a : b, 0)
+        return depths[id]
+      }
+      this.conversation.map(k => k.id).map(subTreeDepthFor)
+      return Object.keys(depths).reduce((res, id) => {
+        res[id] = depths[id] - 1 // exclude itself
+        return res
+      }, {})
+    },
+    depths () {
+      return this.threadTree.reduce((a, k) => {
+        a[k.id] = k.depth
+        return a
+      }, {})
+    },
+    topLevel () {
+      const topLevel = this.conversation.reduce((tl, cur) =>
+        tl.filter(k => this.getReplies(cur.id).map(v => v.id).indexOf(k.id) === -1), this.conversation)
+      return topLevel
+    },
+    otherTopLevelCount () {
+      return this.topLevel.length - 1
+    },
+    showingTopLevel () {
+      if (this.canDive && this.diveRoot) {
+        return [this.statusMap[this.diveRoot]]
+      }
+      return this.topLevel
+    },
+    diveRoot () {
+      const statusId = this.inlineDivePosition || this.statusId
+      const isTopLevel = !this.parentOf(statusId)
+      return isTopLevel ? null : statusId
+    },
+    diveDepth () {
+      return this.canDive && this.diveRoot ? this.depths[this.diveRoot] : 0
+    },
+    diveMode () {
+      return this.canDive && !!this.diveRoot
+    },
+    shouldShowAllConversationButton () {
+      // The "show all conversation" button tells the user that there exist
+      // other toplevel statuses, so do not show it if there is only a single root
+      return this.isTreeView && this.isExpanded && this.diveMode && this.topLevel.length > 1
+    },
+    shouldShowAncestors () {
+      return this.isTreeView && this.isExpanded && this.ancestorsOf(this.diveRoot).length
+    },
     replies () {
       let i = 1
       // eslint-disable-next-line camelcase
@@ -109,15 +279,71 @@ const conversation = {
       }, {})
     },
     isExpanded () {
-      return this.expanded || this.isPage
+      return !!(this.expanded || this.isPage)
     },
     hiddenStyle () {
       const height = (this.status && this.status.virtualHeight) || '120px'
       return this.virtualHidden ? { height } : {}
+    },
+    threadDisplayStatus () {
+      return this.conversation.reduce((a, k) => {
+        const id = k.id
+        const depth = this.depths[id]
+        const status = (() => {
+          if (this.threadDisplayStatusObject[id]) {
+            return this.threadDisplayStatusObject[id]
+          }
+          if ((depth - this.diveDepth) <= this.maxDepthToShowByDefault) {
+            return 'showing'
+          } else {
+            return 'hidden'
+          }
+        })()
+
+        a[id] = status
+        return a
+      }, {})
+    },
+    statusContentProperties () {
+      return this.conversation.reduce((a, k) => {
+        const id = k.id
+        const props = (() => {
+          const def = {
+            showingTall: false,
+            expandingSubject: false,
+            showingLongSubject: false,
+            isReplying: false,
+            mediaPlaying: []
+          }
+
+          if (this.statusContentPropertiesObject[id]) {
+            return {
+              ...def,
+              ...this.statusContentPropertiesObject[id]
+            }
+          }
+          return def
+        })()
+
+        a[id] = props
+        return a
+      }, {})
+    },
+    canDive () {
+      return this.isTreeView && this.isExpanded
+    },
+    focused () {
+      return (id) => {
+        return (this.isExpanded) && id === this.highlight
+      }
+    },
+    maybeHighlight () {
+      return this.isExpanded ? this.highlight : null
     }
   },
   components: {
-    Status
+    Status,
+    ThreadTree
   },
   watch: {
     statusId (newVal, oldVal) {
@@ -132,6 +358,8 @@ const conversation = {
     expanded (value) {
       if (value) {
         this.fetchConversation()
+      } else {
+        this.resetDisplayState()
       }
     },
     virtualHidden (value) {
@@ -161,8 +389,8 @@ const conversation = {
     getReplies (id) {
       return this.replies[id] || []
     },
-    focused (id) {
-      return (this.isExpanded) && id === this.statusId
+    getHighlight () {
+      return this.isExpanded ? this.highlight : null
     },
     setHighlight (id) {
       if (!id) return
@@ -170,15 +398,139 @@ const conversation = {
       this.$store.dispatch('fetchFavsAndRepeats', id)
       this.$store.dispatch('fetchEmojiReactionsBy', id)
     },
-    getHighlight () {
-      return this.isExpanded ? this.highlight : null
-    },
     toggleExpanded () {
       this.expanded = !this.expanded
     },
     getConversationId (statusId) {
       const status = this.$store.state.statuses.allStatusesObject[statusId]
       return get(status, 'retweeted_status.statusnet_conversation_id', get(status, 'statusnet_conversation_id'))
+    },
+    setThreadDisplay (id, nextStatus) {
+      this.threadDisplayStatusObject = {
+        ...this.threadDisplayStatusObject,
+        [id]: nextStatus
+      }
+    },
+    toggleThreadDisplay (id) {
+      const curStatus = this.threadDisplayStatus[id]
+      const nextStatus = curStatus === 'showing' ? 'hidden' : 'showing'
+      this.setThreadDisplay(id, nextStatus)
+    },
+    setThreadDisplayRecursively (id, nextStatus) {
+      this.setThreadDisplay(id, nextStatus)
+      this.getReplies(id).map(k => k.id).map(id => this.setThreadDisplayRecursively(id, nextStatus))
+    },
+    showThreadRecursively (id) {
+      this.setThreadDisplayRecursively(id, 'showing')
+    },
+    setStatusContentProperty (id, name, value) {
+      this.statusContentPropertiesObject = {
+        ...this.statusContentPropertiesObject,
+        [id]: {
+          ...this.statusContentPropertiesObject[id],
+          [name]: value
+        }
+      }
+    },
+    toggleStatusContentProperty (id, name) {
+      this.setStatusContentProperty(id, name, !this.statusContentProperties[id][name])
+    },
+    leastVisibleAncestor (id) {
+      let cur = id
+      let parent = this.parentOf(cur)
+      while (cur) {
+        // if the parent is showing it means cur is visible
+        if (this.threadDisplayStatus[parent] === 'showing') {
+          return cur
+        }
+        parent = this.parentOf(parent)
+        cur = this.parentOf(cur)
+      }
+      // nothing found, fall back to toplevel
+      return this.topLevel[0] ? this.topLevel[0].id : undefined
+    },
+    diveIntoStatus (id, preventScroll) {
+      this.tryScrollTo(id)
+    },
+    diveToTopLevel () {
+      this.tryScrollTo(this.topLevelAncestorOrSelfId(this.diveRoot) || this.topLevel[0].id)
+    },
+    // only used when we are not on a page
+    undive () {
+      this.inlineDivePosition = null
+      this.setHighlight(this.statusId)
+    },
+    tryScrollTo (id) {
+      if (!id) {
+        return
+      }
+      if (this.isPage) {
+        // set statusId
+        this.$router.push({ name: 'conversation', params: { id } })
+      } else {
+        this.inlineDivePosition = id
+      }
+      // Because the conversation can be unmounted when out of sight
+      // and mounted again when it comes into sight,
+      // the `mounted` or `created` function in `status` should not
+      // contain scrolling calls, as we do not want the page to jump
+      // when we scroll with an expanded conversation.
+      //
+      // Now the method is to rely solely on the `highlight` watcher
+      // in `status` components.
+      // In linear views, all statuses are rendered at all times, but
+      // in tree views, it is possible that a change in active status
+      // removes and adds status components (e.g. an originally child
+      // status becomes an ancestor status, and thus they will be
+      // different).
+      // Here, let the components be rendered first, in order to trigger
+      // the `highlight` watcher.
+      this.$nextTick(() => {
+        this.setHighlight(id)
+      })
+    },
+    goToCurrent () {
+      this.tryScrollTo(this.diveRoot || this.topLevel[0].id)
+    },
+    statusById (id) {
+      return this.statusMap[id]
+    },
+    parentOf (id) {
+      const status = this.statusById(id)
+      if (!status) {
+        return undefined
+      }
+      const { in_reply_to_status_id: parentId } = status
+      if (!this.statusMap[parentId]) {
+        return undefined
+      }
+      return parentId
+    },
+    parentOrSelf (id) {
+      return this.parentOf(id) || id
+    },
+    // Ancestors of some status, from top to bottom
+    ancestorsOf (id) {
+      const ancestors = []
+      let cur = this.parentOf(id)
+      while (cur) {
+        ancestors.unshift(this.statusMap[cur])
+        cur = this.parentOf(cur)
+      }
+      return ancestors
+    },
+    topLevelAncestorOrSelfId (id) {
+      let cur = id
+      let parent = this.parentOf(id)
+      while (parent) {
+        cur = this.parentOf(cur)
+        parent = this.parentOf(parent)
+      }
+      return cur
+    },
+    resetDisplayState () {
+      this.undive()
+      this.threadDisplayStatusObject = {}
     }
   }
 }
diff --git a/src/components/conversation/conversation.vue b/src/components/conversation/conversation.vue
index 3fb26d92..7628ceaa 100644
--- a/src/components/conversation/conversation.vue
+++ b/src/components/conversation/conversation.vue
@@ -18,24 +18,168 @@
         {{ $t('timeline.collapse') }}
       </button>
     </div>
-    <status
-      v-for="status in conversation"
-      :key="status.id"
-      ref="statusComponent"
-      :inline-expanded="collapsable && isExpanded"
-      :statusoid="status"
-      :expandable="!isExpanded"
-      :show-pinned="pinnedStatusIdsObject && pinnedStatusIdsObject[status.id]"
-      :focused="focused(status.id)"
-      :in-conversation="isExpanded"
-      :highlight="getHighlight()"
-      :replies="getReplies(status.id)"
-      :in-profile="inProfile"
-      :profile-user-id="profileUserId"
-      class="conversation-status status-fadein panel-body"
-      @goto="setHighlight"
-      @toggleExpanded="toggleExpanded"
-    />
+    <div class="conversation-body panel-body">
+      <div
+        v-if="isTreeView"
+        class="thread-body"
+      >
+        <div
+          v-if="shouldShowAllConversationButton"
+          class="conversation-dive-to-top-level-box"
+        >
+          <i18n
+            path="status.show_all_conversation_with_icon"
+            tag="button"
+            class="button-unstyled -link"
+            @click.prevent="diveToTopLevel"
+          >
+            <FAIcon
+              place="icon"
+              icon="angle-double-left"
+            />
+            <span place="text">
+              {{ $tc('status.show_all_conversation', otherTopLevelCount, { numStatus: otherTopLevelCount }) }}
+            </span>
+          </i18n>
+        </div>
+        <div
+          v-if="shouldShowAncestors"
+          class="thread-ancestors"
+        >
+          <div
+            v-for="status in ancestorsOf(diveRoot)"
+            :key="status.id"
+            class="thread-ancestor"
+            :class="{'thread-ancestor-has-other-replies': getReplies(status.id).length > 1, '-faded': shouldFadeAncestors}"
+          >
+            <status
+              ref="statusComponent"
+              :inline-expanded="collapsable && isExpanded"
+              :statusoid="status"
+              :expandable="!isExpanded"
+              :show-pinned="pinnedStatusIdsObject && pinnedStatusIdsObject[status.id]"
+              :focused="focused(status.id)"
+              :in-conversation="isExpanded"
+              :highlight="getHighlight()"
+              :replies="getReplies(status.id)"
+              :in-profile="inProfile"
+              :profile-user-id="profileUserId"
+              class="conversation-status status-fadein panel-body"
+
+              :simple-tree="treeViewIsSimple"
+              :toggle-thread-display="toggleThreadDisplay"
+              :thread-display-status="threadDisplayStatus"
+              :show-thread-recursively="showThreadRecursively"
+              :total-reply-count="totalReplyCount"
+              :total-reply-depth="totalReplyDepth"
+              :show-other-replies-as-button="showOtherRepliesButtonInsideStatus"
+              :dive="() => diveIntoStatus(status.id)"
+
+              :controlled-showing-tall="statusContentProperties[status.id].showingTall"
+              :controlled-expanding-subject="statusContentProperties[status.id].expandingSubject"
+              :controlled-showing-long-subject="statusContentProperties[status.id].showingLongSubject"
+              :controlled-replying="statusContentProperties[status.id].replying"
+              :controlled-media-playing="statusContentProperties[status.id].mediaPlaying"
+              :controlled-toggle-showing-tall="() => toggleStatusContentProperty(status.id, 'showingTall')"
+              :controlled-toggle-expanding-subject="() => toggleStatusContentProperty(status.id, 'expandingSubject')"
+              :controlled-toggle-showing-long-subject="() => toggleStatusContentProperty(status.id, 'showingLongSubject')"
+              :controlled-toggle-replying="() => toggleStatusContentProperty(status.id, 'replying')"
+              :controlled-set-media-playing="(newVal) => toggleStatusContentProperty(status.id, 'mediaPlaying', newVal)"
+
+              @goto="setHighlight"
+              @toggleExpanded="toggleExpanded"
+            />
+            <div
+              v-if="showOtherRepliesButtonBelowStatus && getReplies(status.id).length > 1"
+              class="thread-ancestor-dive-box"
+            >
+              <div
+                class="thread-ancestor-dive-box-inner"
+              >
+                <i18n
+                  tag="button"
+                  path="status.ancestor_follow_with_icon"
+                  class="button-unstyled -link thread-tree-show-replies-button"
+                  @click.prevent="diveIntoStatus(status.id)"
+                >
+                  <FAIcon
+                    place="icon"
+                    icon="angle-double-right"
+                  />
+                  <span place="text">
+                    {{ $tc('status.ancestor_follow', getReplies(status.id).length - 1, { numReplies: getReplies(status.id).length - 1 }) }}
+                  </span>
+                </i18n>
+              </div>
+            </div>
+          </div>
+        </div>
+        <thread-tree
+          v-for="status in showingTopLevel"
+          :key="status.id"
+          ref="statusComponent"
+          :depth="0"
+
+          :status="status"
+          :in-profile="inProfile"
+          :conversation="conversation"
+          :collapsable="collapsable"
+          :is-expanded="isExpanded"
+          :pinned-status-ids-object="pinnedStatusIdsObject"
+          :profile-user-id="profileUserId"
+
+          :focused="focused"
+          :get-replies="getReplies"
+          :highlight="maybeHighlight"
+          :set-highlight="setHighlight"
+          :toggle-expanded="toggleExpanded"
+
+          :simple="treeViewIsSimple"
+          :toggle-thread-display="toggleThreadDisplay"
+          :thread-display-status="threadDisplayStatus"
+          :show-thread-recursively="showThreadRecursively"
+          :total-reply-count="totalReplyCount"
+          :total-reply-depth="totalReplyDepth"
+          :status-content-properties="statusContentProperties"
+          :set-status-content-property="setStatusContentProperty"
+          :toggle-status-content-property="toggleStatusContentProperty"
+          :dive="canDive ? diveIntoStatus : undefined"
+        />
+      </div>
+      <div
+        v-if="isLinearView"
+        class="thread-body"
+      >
+        <status
+          v-for="status in conversation"
+          :key="status.id"
+          ref="statusComponent"
+          :inline-expanded="collapsable && isExpanded"
+          :statusoid="status"
+          :expandable="!isExpanded"
+          :show-pinned="pinnedStatusIdsObject && pinnedStatusIdsObject[status.id]"
+          :focused="focused(status.id)"
+          :in-conversation="isExpanded"
+          :highlight="getHighlight()"
+          :replies="getReplies(status.id)"
+          :in-profile="inProfile"
+          :profile-user-id="profileUserId"
+          class="conversation-status status-fadein panel-body"
+
+          :toggle-thread-display="toggleThreadDisplay"
+          :thread-display-status="threadDisplayStatus"
+          :show-thread-recursively="showThreadRecursively"
+          :total-reply-count="totalReplyCount"
+          :total-reply-depth="totalReplyDepth"
+          :status-content-properties="statusContentProperties"
+          :set-status-content-property="setStatusContentProperty"
+          :toggle-status-content-property="toggleStatusContentProperty"
+
+          @goto="setHighlight"
+          @toggleExpanded="toggleExpanded"
+        />
+      </div>
+    </div>
   </div>
   <div
     v-else
@@ -49,19 +193,74 @@
 @import '../../_variables.scss';
 
 .Conversation {
-  .conversation-status {
+  .conversation-dive-to-top-level-box {
+    padding: var(--status-margin, $status-margin);
     border-bottom-width: 1px;
     border-bottom-style: solid;
     border-bottom-color: var(--border, $fallback--border);
     border-radius: 0;
+    /* Make the button stretch along the whole row */
+    display: flex;
+    align-items: stretch;
+    flex-direction: column;
+  }
+
+  .thread-ancestors {
+    margin-left: var(--status-margin, $status-margin);
+    border-left: 2px solid var(--border, $fallback--border);
   }
 
-  &.-expanded {
-    .conversation-status:last-child {
-      border-bottom: none;
-      border-radius: 0 0 $fallback--panelRadius $fallback--panelRadius;
-      border-radius: 0 0 var(--panelRadius, $fallback--panelRadius) var(--panelRadius, $fallback--panelRadius);
+  .thread-ancestor.-faded .StatusContent {
+    --link: var(--faintLink);
+    --text: var(--faint);
+    color: var(--text);
+  }
+  .thread-ancestor-dive-box {
+    padding-left: var(--status-margin, $status-margin);
+    border-bottom-width: 1px;
+    border-bottom-style: solid;
+    border-bottom-color: var(--border, $fallback--border);
+    border-radius: 0;
+    /* Make the button stretch along the whole row */
+    &, &-inner {
+      display: flex;
+      align-items: stretch;
+      flex-direction: column;
     }
   }
+  .thread-ancestor-dive-box-inner {
+    padding: var(--status-margin, $status-margin);
+  }
+
+  .conversation-status {
+    border-bottom-width: 1px;
+    border-bottom-style: solid;
+    border-bottom-color: var(--border, $fallback--border);
+    border-radius: 0;
+  }
+
+  .thread-ancestor-has-other-replies .conversation-status,
+  .thread-ancestor:last-child .conversation-status,
+  .thread-ancestor:last-child .thread-ancestor-dive-box,
+  &.-expanded .thread-tree .conversation-status {
+    border-bottom: none;
+  }
+
+  .thread-ancestors + .thread-tree > .conversation-status {
+    border-top-width: 1px;
+    border-top-style: solid;
+    border-top-color: var(--border, $fallback--border);
+  }
+
+  /* expanded conversation in timeline */
+  &.status-fadein.-expanded .thread-body {
+    border-left-width: 4px;
+    border-left-style: solid;
+    border-left-color: $fallback--cRed;
+    border-left-color: var(--cRed, $fallback--cRed);
+    border-radius: 0 0 $fallback--panelRadius $fallback--panelRadius;
+    border-radius: 0 0 var(--panelRadius, $fallback--panelRadius) var(--panelRadius, $fallback--panelRadius);
+    border-bottom: 1px solid var(--border, $fallback--border);
+  }
 }
 </style>