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/* make use of negative margins for overlapping tabs */
QTabBar::tab:selected {
/* expand/overlap to the left and right by 4px */
   margin-left:	-3px;
   margin-right: 	-3px;
 }
QTabBar::tab:first:selected {
   margin-left: 0; /* the first selected tab has nothing to overlap with on the left */
}
QTabBar::tab:last:selected {
    margin-right: 0; /* the last selected tab has nothing to overlap with on the right */
 }
 QTabBar::tab:only-one {
     margin: 0; /* if there is only one tab, we don't want overlapping margins *
 }