diff --git a/src/InputHandler.ts b/src/InputHandler.ts
index e1223e7e..34131a15 100644
--- a/src/InputHandler.ts
+++ b/src/InputHandler.ts
@@ -57,7 +57,7 @@ export class InputHandler implements IInputHandler {
           this._terminal.y++;
           if (this._terminal.y > this._terminal.scrollBottom) {
             this._terminal.y--;
-            this._terminal.scroll();
+            this._terminal.scroll(true);
           }
         } else {
           if (ch_width === 2)  // FIXME: check for xterm behavior
diff --git a/src/Linkifier.test.ts b/src/Linkifier.test.ts
index 2450ffb9..c6e59d84 100644
--- a/src/Linkifier.test.ts
+++ b/src/Linkifier.test.ts
@@ -119,6 +119,12 @@ describe('Linkifier', () => {
       it('should match a link immediately after a link at the end of a text node', done => {
         assertLinkifiesRow('<span>foo bar</span>baz', /bar|baz/, '<span>foo <a>bar</a></span><a>baz</a>', done);
       });
+      it('should not duplicate text after a unicode character (wrapped in a span)', done => {
+        // This is a regression test for an issue that came about when using
+        // an oh-my-zsh theme that added the large blue diamond unicode
+        // character (U+1F537) which caused the path to be duplicated. See #642.
+        assertLinkifiesRow('echo \'<span class="xterm-normal-char">🔷</span>foo\'', /foo/, 'echo \'<span class="xterm-normal-char">🔷</span><a>foo</a>\'', done);
+      });
     });
 
     describe('validationCallback', () => {
diff --git a/src/Linkifier.ts b/src/Linkifier.ts
index f99cdaa4..bc4949b1 100644
--- a/src/Linkifier.ts
+++ b/src/Linkifier.ts
@@ -200,7 +200,7 @@ export class Linkifier {
    * Linkifies a row given a specific handler.
    * @param {HTMLElement} row The row to linkify.
    * @param {LinkMatcher} matcher The link matcher for this line.
-   * @return The link element if it was added, otherwise undefined.
+   * @return The link element(s) that were added.
    */
   private _doLinkifyRow(row: HTMLElement, matcher: LinkMatcher): HTMLElement[] {
     // Iterate over nodes as we want to consider text nodes
@@ -235,8 +235,21 @@ export class Linkifier {
             element.innerHTML = '';
             element.appendChild(linkElement);
           }
+        } else if (node.childNodes.length > 1) {
+          // Matches part of string in an element with multiple child nodes
+          for (let j = 0; j < node.childNodes.length; j++) {
+            const childNode = node.childNodes[j];
+            const childSearchIndex = childNode.textContent.indexOf(uri);
+            if (childSearchIndex !== -1) {
+              // Match found in currentNode
+              this._replaceNodeSubstringWithNode(childNode, linkElement, uri, childSearchIndex);
+              // Don't need to count nodesAdded by replacing the node as this
+              // is a child node, not a top-level node.
+              break;
+            }
+          }
         } else {
-          // Matches part of string
+          // Matches part of string in a single text node
           const nodesAdded = this._replaceNodeSubstringWithNode(node, linkElement, uri, searchIndex);
           // No need to consider the new nodes
           i += nodesAdded;
@@ -308,25 +321,26 @@ export class Linkifier {
    * @return The number of nodes to skip when searching for the next uri.
    */
   private _replaceNodeSubstringWithNode(targetNode: Node, newNode: Node, substring: string, substringIndex: number): number {
-    let node = targetNode;
-    if (node.nodeType !== 3/*Node.TEXT_NODE*/) {
-      node = node.childNodes[0];
+    // If the targetNode is a non-text node with a single child, make the child
+    // the new targetNode.
+    if (targetNode.childNodes.length === 1) {
+      targetNode = targetNode.childNodes[0];
     }
 
     // The targetNode will be either a text node or a <span>. The text node
     // (targetNode or its only-child) needs to be replaced with newNode plus new
     // text nodes potentially on either side.
-    if (node.childNodes.length === 0 && node.nodeType !== 3/*Node.TEXT_NODE*/) {
+    if (targetNode.nodeType !== 3/*Node.TEXT_NODE*/) {
       throw new Error('targetNode must be a text node or only contain a single text node');
     }
 
-    const fullText = node.textContent;
+    const fullText = targetNode.textContent;
 
     if (substringIndex === 0) {
       // Replace with <newNode><textnode>
       const rightText = fullText.substring(substring.length);
       const rightTextNode = this._document.createTextNode(rightText);
-      this._replaceNode(node, newNode, rightTextNode);
+      this._replaceNode(targetNode, newNode, rightTextNode);
       return 0;
     }
 
@@ -334,7 +348,7 @@ export class Linkifier {
       // Replace with <textnode><newNode>
       const leftText = fullText.substring(0, substringIndex);
       const leftTextNode = this._document.createTextNode(leftText);
-      this._replaceNode(node, leftTextNode, newNode);
+      this._replaceNode(targetNode, leftTextNode, newNode);
       return 0;
     }
 
@@ -343,7 +357,7 @@ export class Linkifier {
     const leftTextNode = this._document.createTextNode(leftText);
     const rightText = fullText.substring(substringIndex + substring.length);
     const rightTextNode = this._document.createTextNode(rightText);
-    this._replaceNode(node, leftTextNode, newNode, rightTextNode);
+    this._replaceNode(targetNode, leftTextNode, newNode, rightTextNode);
     return 1;
   }
 }
diff --git a/src/Renderer.ts b/src/Renderer.ts
index f0f50f61..7d8c6f85 100644
--- a/src/Renderer.ts
+++ b/src/Renderer.ts
@@ -353,9 +353,8 @@ export class Renderer {
     const endCol = viewportCappedStartRow === viewportCappedEndRow ? end[0] : this._terminal.cols;
     documentFragment.appendChild(this._createSelectionElement(viewportCappedStartRow, startCol, endCol));
     // Draw middle rows
-    for (let i = viewportCappedStartRow + 1; i < viewportCappedEndRow; i++) {
-      documentFragment.appendChild(this._createSelectionElement(i, 0, this._terminal.cols));
-    }
+    const middleRowsCount = viewportCappedEndRow - viewportCappedStartRow - 1;
+    documentFragment.appendChild(this._createSelectionElement(viewportCappedStartRow + 1, 0, this._terminal.cols, middleRowsCount));
     // Draw final row
     if (viewportCappedStartRow !== viewportCappedEndRow) {
       // Only draw viewportEndRow if it's not the same as viewporttartRow
@@ -371,9 +370,9 @@ export class Renderer {
    * @param colStart The start column.
    * @param colEnd The end columns.
    */
-  private _createSelectionElement(row: number, colStart: number, colEnd: number): HTMLElement {
+  private _createSelectionElement(row: number, colStart: number, colEnd: number, rowCount: number = 1): HTMLElement {
     const element = document.createElement('div');
-    element.style.height = `${this._terminal.charMeasure.height}px`;
+    element.style.height = `${rowCount * this._terminal.charMeasure.height}px`;
     element.style.top = `${row * this._terminal.charMeasure.height}px`;
     element.style.left = `${colStart * this._terminal.charMeasure.width}px`;
     element.style.width = `${this._terminal.charMeasure.width * (colEnd - colStart)}px`;
diff --git a/src/SelectionManager.ts b/src/SelectionManager.ts
index e2ba3756..930f09d1 100644
--- a/src/SelectionManager.ts
+++ b/src/SelectionManager.ts
@@ -184,12 +184,24 @@ export class SelectionManager extends EventEmitter {
 
     // Get middle rows
     for (let i = start[1] + 1; i <= end[1] - 1; i++) {
-      result.push(translateBufferLineToString(this._buffer.get(i), true));
+      const bufferLine = this._buffer.get(i);
+      const lineText = translateBufferLineToString(bufferLine, true);
+      if (bufferLine.isWrapped) {
+        result[result.length - 1] += lineText;
+      } else {
+        result.push(lineText);
+      }
     }
 
     // Get final row
     if (start[1] !== end[1]) {
-      result.push(translateBufferLineToString(this._buffer.get(end[1]), true, 0, end[0]));
+      const bufferLine = this._buffer.get(end[1]);
+      const lineText = translateBufferLineToString(bufferLine, true, 0, end[0]);
+      if (bufferLine.isWrapped) {
+        result[result.length - 1] += lineText;
+      } else {
+        result.push(lineText);
+      }
     }
 
     // Format string by replacing non-breaking space chars with regular spaces
@@ -291,6 +303,9 @@ export class SelectionManager extends EventEmitter {
       return;
     }
 
+    // Tell the browser not to start a regular selection
+    event.preventDefault();
+
     // Reset drag scroll state
     this._dragScrollAmount = 0;
 
diff --git a/src/xterm.js b/src/xterm.js
index 8f2d64e3..b485069a 100644
--- a/src/xterm.js
+++ b/src/xterm.js
@@ -782,7 +782,8 @@ Terminal.loadAddon = function(addon, callback) {
 Terminal.prototype.updateCharSizeStyles = function() {
   this.charSizeStyleElement.textContent =
       `.xterm-wide-char{width:${this.charMeasure.width * 2}px;}` +
-      `.xterm-normal-char{width:${this.charMeasure.width}px;}`;
+      `.xterm-normal-char{width:${this.charMeasure.width}px;}` +
+      `.xterm-rows > div{height:${this.charMeasure.height}px;}`;
 }
 
 /**
@@ -1119,8 +1120,10 @@ Terminal.prototype.showCursor = function() {
 
 /**
  * Scroll the terminal down 1 row, creating a blank line.
+ * @param {boolean} isWrapped Whether the new line is wrapped from the previous
+ * line.
  */
-Terminal.prototype.scroll = function() {
+Terminal.prototype.scroll = function(isWrapped) {
   var row;
 
   // Make room for the new row in lines
@@ -1147,10 +1150,10 @@ Terminal.prototype.scroll = function() {
 
   if (row === this.lines.length) {
     // Optimization: pushing is faster than splicing when they amount to the same behavior
-    this.lines.push(this.blankLine());
+    this.lines.push(this.blankLine(undefined, isWrapped));
   } else {
     // add our new line
-    this.lines.splice(row, 0, this.blankLine());
+    this.lines.splice(row, 0, this.blankLine(undefined, isWrapped));
   }
 
   if (this.scrollTop !== 0) {
@@ -2129,8 +2132,9 @@ Terminal.prototype.eraseLine = function(y) {
 /**
  * Return the data array of a blank line
  * @param {number} cur First bunch of data for each "blank" character.
+ * @param {boolean} isWrapped Whether the new line is wrapped from the previous line.
  */
-Terminal.prototype.blankLine = function(cur) {
+Terminal.prototype.blankLine = function(cur, isWrapped) {
   var attr = cur
   ? this.eraseAttr()
   : this.defAttr;
@@ -2139,6 +2143,12 @@ Terminal.prototype.blankLine = function(cur) {
   , line = []
   , i = 0;
 
+  // TODO: It is not ideal that this is a property on an array, a buffer line
+  // class should be added that will hold this data and other useful functions.
+  if (isWrapped) {
+    line.isWrapped = isWrapped;
+  }
+
   for (; i < this.cols; i++) {
     line[i] = ch;
   }