diff --git a/CHANGELOG b/CHANGELOG
index 92b31043d..65889089a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -37,7 +37,7 @@ Motions:
 - Added config value for pagenumber alignment in PDF [#3327].
 - Bugfix: Several bugfixes regarding splitting list items in
   change recommendations [#3288].
-- Bugfix: Several bugfixes regarding diff version [#3407, #3408].
+- Bugfix: Several bugfixes regarding diff version [#3407, #3408, #3410].
 - Added inline Editing for motion reason [#3361].
 - Added multiselect filter for motion comments [#3372].
 - Added support for pinning personal notes to the window [#3360].
diff --git a/openslides/motions/static/js/motions/diff.js b/openslides/motions/static/js/motions/diff.js
index 6e2a6d7d0..2f2af8bbc 100644
--- a/openslides/motions/static/js/motions/diff.js
+++ b/openslides/motions/static/js/motions/diff.js
@@ -671,6 +671,8 @@ angular.module('OpenSlidesApp.motions.diff', ['OpenSlidesApp.motions.lineNumberi
             for (var ent in entities) {
                 html = html.replace(new RegExp(ent, 'g'), entities[ent]);
             }
+            html = html.replace(/[ \n\t]+/gi, ' ');
+            html = html.replace(/(<\/(div|p|ul|li|blockquote>)>) /gi, "$1\n");
 
             return html;
         };
@@ -1049,14 +1051,16 @@ angular.module('OpenSlidesApp.motions.diff', ['OpenSlidesApp.motions.lineNumberi
             // The "!!(found=...)"-construction is only used to make jshint happy :)
             var findDel = /<del>(.*?)<\/del>/gi,
                 findIns = /<ins>(.*?)<\/ins>/gi,
-                found;
+                found, inner;
             while (!!(found = findDel.exec(html))) {
-                if (found[1].match(/<[^>]*>/)) {
+                inner = found[1].replace(/<br[^>]*>/gi, '');
+                if (inner.match(/<[^>]*>/)) {
                     return true;
                 }
             }
             while (!!(found = findIns.exec(html))) {
-                if (found[1].match(/<[^>]*>/)) {
+                inner = found[1].replace(/<br[^>]*>/gi, '');
+                if (inner.match(/<[^>]*>/)) {
                     return true;
                 }
             }
diff --git a/openslides/motions/static/js/motions/linenumbering.js b/openslides/motions/static/js/motions/linenumbering.js
index 93faed1e9..4ef1eb5b6 100644
--- a/openslides/motions/static/js/motions/linenumbering.js
+++ b/openslides/motions/static/js/motions/linenumbering.js
@@ -202,7 +202,7 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
                             lineBreakAt = i - 1;
                         }
                     }
-                    if (lineBreakAt !== null && node.nodeValue[i] != ' ') {
+                    if (lineBreakAt !== null && (node.nodeValue[i] !== ' ' && node.nodeValue[i] !== "\n")) {
                         var currLine = node.nodeValue.substring(currLineStart, lineBreakAt + 1);
                         addLine(currLine, highlight);
 
@@ -211,7 +211,7 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
                         lastBreakableIndex = null;
                     }
 
-                    if (node.nodeValue[i] == ' ' || node.nodeValue[i] == '-') {
+                    if (node.nodeValue[i] === ' ' || node.nodeValue[i] === '-' || node.nodeValue[i] === "\n") {
                         lastBreakableIndex = i;
                     }
 
@@ -413,6 +413,12 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
         this._stripLineNumbers = function (node) {
             for (var i = 0; i < node.childNodes.length; i++) {
                 if (this._isOsLineBreakNode(node.childNodes[i]) || this._isOsLineNumberNode(node.childNodes[i])) {
+                    // If a newline character follows a line break, it's been very likely inserted by the WYSIWYG-editor
+                    if (node.childNodes.length > (i + 1) && node.childNodes[i + 1].nodeType === TEXT_NODE) {
+                        if (node.childNodes[i + 1].nodeValue[0] === "\n") {
+                            node.childNodes[i + 1].nodeValue = " " + node.childNodes[i + 1].nodeValue.substring(1);
+                        }
+                    }
                     node.removeChild(node.childNodes[i]);
                     i--;
                 } else {
@@ -439,6 +445,9 @@ angular.module('OpenSlidesApp.motions.lineNumbering', [])
          * @param {number|null} firstLine
          */
         this.insertLineNumbersNode = function (html, lineLength, highlight, firstLine) {
+            // Removing newlines after BRs, as they lead to problems like #3410
+            html = html.replace(/(<br[^>]*>)[\n\r]+/gi, '$1');
+
             var root = document.createElement('div');
             root.innerHTML = html;
 
diff --git a/tests/karma/motions/diff.service.test.js b/tests/karma/motions/diff.service.test.js
index e4a678d82..08ac0accf 100644
--- a/tests/karma/motions/diff.service.test.js
+++ b/tests/karma/motions/diff.service.test.js
@@ -399,6 +399,12 @@ describe('linenumbering', function () {
           normalized = diffService._normalizeHtmlForDiff(unnormalized);
       expect(normalized).toBe("<P CLASS='os-split-after os-split-before'>Test</P>");
     });
+
+    it('treats newlines like spaces', function () {
+      var unnormalized = "<P>Test line\n\t 2</P>",
+          normalized = diffService._normalizeHtmlForDiff(unnormalized);
+      expect(normalized).toBe("<P>Test line 2</P>");
+    });
   });
 
   describe('the core diff algorithm', function () {
@@ -521,7 +527,7 @@ describe('linenumbering', function () {
           after = "<p>sem. Nulla consequat massa quis enim. TEST<br>\nTEST</p>";
       var diff = diffService.diff(before, after);
 
-      expect(diff).toBe('<p>sem. Nulla consequat massa quis enim.<ins> TEST<br>' + "\n" + "TEST</ins></p>");
+      expect(diff).toBe('<p>sem. Nulla consequat massa quis enim.<ins> TEST<br> TEST</ins></p>');
     });
 
     it('does not repeat the last word (2)', function () {
diff --git a/tests/karma/motions/linenumbering.service.test.js b/tests/karma/motions/linenumbering.service.test.js
index 4c905b190..17692519c 100644
--- a/tests/karma/motions/linenumbering.service.test.js
+++ b/tests/karma/motions/linenumbering.service.test.js
@@ -145,6 +145,12 @@ describe('linenumbering', function () {
       expect(lineNumberingService.stripLineNumbers(outHtml)).toBe(inHtml);
       expect(lineNumberingService.insertLineBreaksWithoutNumbers(outHtml, 80)).toBe(outHtml);
     });
+
+    it('treats ascii newline characters like spaces', function () {
+      var inHtml = "<p>Test 123\nTest1</p>";
+      var outHtml = lineNumberingService.insertLineNumbers(inHtml, 5);
+      expect(outHtml).toBe('<p>' + noMarkup(1) + 'Test ' + brMarkup(2) + "123\n" + brMarkup(3) + 'Test1</p>');
+    });
   });
 
 
@@ -291,6 +297,12 @@ describe('linenumbering', function () {
         expect(lineNumberingService.stripLineNumbers(outHtml)).toBe(inHtml);
         expect(lineNumberingService.insertLineBreaksWithoutNumbers(outHtml, 80)).toBe(outHtml);
     });
+
+    it('cancels newlines after br-elements', function () {
+      var inHtml = "<p>Test 123<br>\nTest 456</p>";
+      var outHtml = lineNumberingService.insertLineNumbers(inHtml, 80);
+      expect(outHtml).toBe("<p>" + noMarkup(1) + "Test 123<br>" + noMarkup(2) + "Test 456</p>");
+    });
   });
 
   describe('line breaking without adding line numbers', function() {