Fixes #729 whitespace at the beginning and end of text mode blocks

src/css/math.less

diff --git a/src/css/math.less b/src/css/math.less
index 743f7ca..bff1201 100644
--- a/src/css/math.less
+++ b/src/css/math.less
@@ -50,7 +50,9 @@
 
   .mq-text-mode {
     display: inline-block;
+    white-space: pre;  
   }
+
   .mq-text-mode.mq-hasCursor {
     box-shadow: inset darkgray 0 .1em .2em;
     padding: 0 .1em;