fixed a bug + made a testcase out of it

src/components/rich_content/rich_content.jsx

@@ -247,12 +247,13 @@ const getLinkData = (attrs, children, index) => {
 export const preProcessPerLine = (html, greentext, handleLinks) => {
   const lastMentions = []
 
-  let nonEmptyIndex = 0
+  let nonEmptyIndex = -1
   const newHtml = convertHtmlToLines(html).reverse().map((item, index, array) => {
     // Going over each line in reverse to detect last mentions,
     // keeping non-text stuff as-is
     if (!item.text) return item
     const string = item.text
+    nonEmptyIndex += 1
 
     // Greentext stuff
     if (greentext && (string.includes('>') || string.includes('<'))) {
@@ -260,10 +261,8 @@ export const preProcessPerLine = (html, greentext, handleLinks) => {
         .replace(/@\w+/gi, '') // remove mentions (even failed ones)
         .trim()
       if (cleanedString.startsWith('>')) {
-        nonEmptyIndex += 1
         return `<span class='greentext'>${string}</span>`
       } else if (cleanedString.startsWith('&lt;')) {
-        nonEmptyIndex += 1
         return `<span class='cyantext'>${string}</span>`
       }
     }

test/unit/specs/components/rich_content.spec.js

@@ -381,4 +381,39 @@ describe('RichContent', () => {
 
     expect(wrapper.html()).to.eql(compwrap(expected))
   })
+
+  it('One buggy example', () => {
+    const html = [
+      'Bruh',
+      'Bruh',
+      [
+        makeMention('foo'),
+        makeMention('bar'),
+        makeMention('baz')
+      ].join(''),
+      'Bruh'
+    ].join('<br>')
+    const expected = [
+      'Bruh',
+      'Bruh',
+      [
+        stubMention('foo'),
+        stubMention('bar'),
+        stubMention('baz')
+      ].join(''),
+      'Bruh'
+    ].join('<br>')
+
+    const wrapper = shallowMount(RichContent, {
+      localVue,
+      propsData: {
+        handleLinks: true,
+        greentext: true,
+        emoji: [],
+        html
+      }
+    })
+
+    expect(wrapper.html()).to.eql(compwrap(expected))
+  })
 })