fixes #5039: properly set .row-fluid margins for .controls-row

less/forms.less

@@ -304,8 +304,12 @@ textarea[class*="span"],
 .controls-row {
   .clearfix(); // Clear the float from controls
 }
-.controls-row [class*="span"] {
-  float: left; // Float to collapse white-space for proper grid alignment
+
+// Float to collapse white-space for proper grid alignment
+.controls-row [class*="span"],
+// Redeclare the fluid grid collapse since we undo the float for inputs
+.row-fluid .controls-row [class*="span"] {
+  float: left;
 }
 
 

less/mixins.less

@@ -642,6 +642,11 @@
         margin-left: 0;
       }
 
+      // Space grid-sized controls properly if multiple per line
+      .controls-row [class*="span"] + [class*="span"] {
+        margin-left: @fluidGridGutterWidth;
+      }
+
       // generate .spanX and .offsetX
       .spanX (@gridColumns);
       .offsetX (@gridColumns);