Merge pull request #1547 from dpvc/issue1539

Fix fractions with line breaks in HTML output.  #1539

Author: dpvc

unpacked/jax/output/CommonHTML/jax.js

@@ -2423,6 +2423,7 @@
       toCommonHTML: function (node) {
         node = this.CHTMLdefaultNode(node,{
           childNodes:["mjx-numerator","mjx-denominator"],
+          childOptions: {autowidth: true},
           forceChild:true, noBBox:true, minChildren:2
         });
         var values = this.getValues("linethickness","displaystyle",
@@ -2610,7 +2611,8 @@
     /********************************************************/
 
     MML.mrow.Augment({
-      toCommonHTML: function (node) {
+      toCommonHTML: function (node,options) {
+        options = options || {};
         node = this.CHTMLdefaultNode(node);
         var bbox = this.CHTML, H = bbox.h, D = bbox.d, hasNegative;
         for (var i = 0, m = this.data.length; i < m; i++) {
@@ -2619,6 +2621,7 @@
         }
         if (this.CHTMLlineBreaks()) {
           this.CHTMLmultiline(node);
+          if (options.autowidth) node.style.width = "";
         } else {
           if (hasNegative && bbox.w) node.style.width = CHTML.Em(Math.max(0,bbox.w));
           if (bbox.w < 0) node.style.marginRight = CHTML.Em(bbox.w);

unpacked/jax/output/HTML-CSS/jax.js

@@ -1296,7 +1296,7 @@
         if (bbox.tw) {BBOX.tw = bbox.tw}
       }
     },
-    alignBox: function (span,align,y,dx) {
+    alignBox: function (span,align,y,dx,noskip) {
       if (dx == null) {dx = 0}
       this.placeBox(span,dx,y); // set y position (and left aligned)
       if (this.msiePlaceBoxBug) {
@@ -1307,7 +1307,7 @@
         while (node && node.nodeName !== "#text") {node = node.previousSibling}
         if (node) {span.removeChild(node)}
       }
-      var bbox = span.bbox; if (bbox.isMultiline) return;
+      var bbox = span.bbox; if (bbox.isMultiline && !noskip) return;
       var isRelative = bbox.width != null && !bbox.isFixed;
       var r = 0, c = dx-bbox.w/2, l = "50%";
       if (this.initialSkipBug) {r = bbox.w-bbox.rw-.1; c += bbox.lw}
@@ -2592,8 +2592,8 @@
 	    HTMLCSS.createRule(rule,t,0,W+2*t);
 	    HTMLCSS.placeBox(rule,0,a-t/2);
 	  }
-	  HTMLCSS.alignBox(num,values.numalign,u);
-	  HTMLCSS.alignBox(den,values.denomalign,-v);
+	  HTMLCSS.alignBox(num,values.numalign,u,0,true);
+	  HTMLCSS.alignBox(den,values.denomalign,-v,0,true);
 	}
 	this.HTMLhandleSpace(span);
 	this.HTMLhandleColor(span);