fixes #13881: restore existing striped progress bar behavior with theme styles

dist/css/bootstrap-theme.css

@@ -354,6 +354,11 @@
   filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffd9534f', endColorstr='#ffc9302c', GradientType=0);
   background-repeat: repeat-x;
 }
+.progress-bar-striped {
+  background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
+  background-image:      -o-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
+  background-image:         linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
+}
 .list-group {
   border-radius: 4px;
   -webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, .075);

docs/examples/theme/index.html

@@ -485,6 +485,14 @@
       <div class="progress">
         <div class="progress-bar progress-bar-danger" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100" style="width: 80%"><span class="sr-only">80% Complete (danger)</span></div>
       </div>
+
+      <div class="progress progress-striped">
+        <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%"><span class="sr-only">100% Complete</span></div>
+      </div>
+      <div class="progress">
+        <div class="progress-bar progress-bar-striped" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%"><span class="sr-only">100% Complete</span></div>
+      </div>
+
       <div class="progress">
         <div class="progress-bar progress-bar-success" style="width: 35%"><span class="sr-only">35% Complete (success)</span></div>
         <div class="progress-bar progress-bar-warning" style="width: 20%"><span class="sr-only">20% Complete (warning)</span></div>

less/theme.less

@@ -197,6 +197,11 @@
 .progress-bar-warning    { .progress-bar-styles(@progress-bar-warning-bg); }
 .progress-bar-danger     { .progress-bar-styles(@progress-bar-danger-bg); }
 
+// Reset the striped class because our mixins don't do multiple gradients and
+// the above custom styles override the new `.progress-bar-striped` in v3.2.0.
+.progress-bar-striped {
+  #gradient > .striped();
+}
 
 
 //