Gracias a biggates y steakpi. Como respuesta a la pregunta Dreamonic, hice algunos pequeños cambios para hacer clic en todos los encabezados (no solo la cadena de título y gluphs) y quité el subrayado del enlace. Para forzar que aparezcan iconos en la misma línea, agregué h4 al final de las instrucciones CSS. Aquí está el código modificado:
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<a class="accordion-toggle collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseOne">
<h4 class="panel-title">Collapsible Group Item #1</h4>
</a>
</div>
<div id="collapseOne" class="panel-collapse collapse">
<div class="panel-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<a class="accordion-toggle collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">
<h4 class="panel-title">Collapsible Group Item #2</h4>
</a>
</div>
<div id="collapseTwo" class="panel-collapse collapse">
<div class="panel-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<a class="accordion-toggle collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
<h4 class="panel-title">Collapsible Group Item #3</h4>
</a>
</div>
<div id="collapseThree" class="panel-collapse collapse">
<div class="panel-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
</div>
Y el CSS modificado:
.panel-heading .accordion-toggle h4:after {
/* symbol for "opening" panels */
font-family: 'Glyphicons Halflings';
content: "\e114";
float: right;
color: grey;
overflow: no-display;
}
.panel-heading .accordion-toggle.collapsed h4:after {
/* symbol for "collapsed" panels */
content: "\e080";
}
a.accordion-toggle{
text-decoration: none;
}