Redo everything in the MR

src/components/gallery/gallery.js

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+import Attachment from '../attachment/attachment.vue'
+import { chunk, last, dropRight } from 'lodash'
+
+const Gallery = {
+  data: () => ({
+    width: 500
+  }),
+  props: [
+    'attachments',
+    'nsfw',
+    'setMedia'
+  ],
+  components: { Attachment },
+  mounted () {
+    this.resize()
+    window.addEventListener('resize', this.resize)
+  },
+  destroyed () {
+    window.removeEventListener('resize', this.resize)
+  },
+  computed: {
+    rows () {
+      if (!this.attachments) {
+        return []
+      }
+      const rows = chunk(this.attachments, 3)
+      if (last(rows).length === 1 && rows.length > 1) {
+        // if 1 attachment on last row -> add it to the previous row instead
+        const lastAttachment = last(rows)[0]
+        const allButLastRow = dropRight(rows)
+        last(allButLastRow).push(lastAttachment)
+        return allButLastRow
+      }
+      return rows
+    },
+    rowHeight () {
+      return itemsPerRow => ({ 'height': `${(this.width / (itemsPerRow + 0.6))}px` })
+    },
+    useContainFit () {
+      return this.$store.state.config.useContainFit
+    }
+  },
+  methods: {
+    resize () {
+      // Quick optimization to make resizing not always trigger state change,
+      // only update attachment size in 10px steps
+      const width = Math.floor(this.$el.getBoundingClientRect().width / 10) * 10
+      if (this.width !== width) {
+        this.width = width
+      }
+    }
+  }
+}
+
+export default Gallery

src/components/gallery/gallery.vue

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+<template>
+  <div ref="galleryContainer" style="width: 100%;">
+    <div class="gallery-row" v-for="row in rows" :style="rowHeight(row.length)" :class="{ 'contain-fit': useContainFit, 'cover-fit': !useContainFit }">
+      <attachment
+        v-for="attachment in row"
+        :setMedia="setMedia"
+        :nsfw="nsfw"
+        :attachment="attachment"
+        :allowPlay="false"
+        :key="attachment.id"
+      />
+    </div>
+  </div>
+</template>
+
+<script src='./gallery.js'></script>
+
+<style lang="scss">
+@import '../../_variables.scss';
+
+.gallery-row {
+  height: 200px;
+  width: 100%;
+  display: flex;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  align-content: stretch;
+  flex-grow: 1;
+  margin-top: 0.5em;
+
+  .attachments, .attachment {
+    margin: 0 0.5em 0 0;
+    flex-grow: 1;
+    height: 100%;
+    box-sizing: border-box;
+  }
+
+  .image-attachment {
+    width: 100%;
+    height: 100%;
+  }
+
+  .video-container {
+    height: 100%;
+  }
+
+  &.contain-fit {
+    img, video {
+      object-fit: contain;
+    }
+  }
+
+  &.cover-fit {
+    img, video {
+      object-fit: cover;
+    }
+  }
+}
+
+</style>