update

iadmin/themes/default/scss/vendor/bootstrap-rtl-sass/_button-groups-rtl.sass

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+//
+// Button groups
+// --------------------------------------------------
+
+// Make the div behave like a button
+.btn-group,
+.btn-group-vertical
+	> .btn
+		float: right
+
+// Prevent double borders when buttons are next to each other
+.btn-group 
+	.btn + .btn,
+	.btn + .btn-group,
+	.btn-group + .btn,
+	.btn-group + .btn-group
+		margin-right: -1px
+
+// Optional: Group multiple button groups together for a toolbar
+.btn-toolbar
+	margin-right: -5px // Offset the first child's margin
+
+	.btn-group,
+	.input-group
+		float: right
+	> .btn,
+	> .btn-group,
+	> .input-group
+		margin-right: 5px
+
+// Set corners individual because sometimes a single button can be in a .btn-group and we need :first-child and :last-child to both match
+.btn-group > .btn:first-child
+	margin-right: 0
+	&:not(:last-child):not(.dropdown-toggle)
+		@include border-left-radius(0)
+		@include border-right-radius($border-radius-base)
+
+// Need .dropdown-toggle since :last-child doesn't apply given a .dropdown-menu immediately after it
+.btn-group > .btn:last-child:not(:first-child),
+.btn-group > .dropdown-toggle:not(:first-child)
+	@include border-right-radius(0)
+	@include border-left-radius($border-radius-base)
+
+// Custom edits for including btn-groups within btn-groups (useful for including dropdown buttons within a btn-group)
+.btn-group > .btn-group
+	float: right
+
+.btn-group > .btn-group:first-child
+	> .btn:last-child,
+	> .dropdown-toggle
+		@include border-left-radius(0)
+		@include border-right-radius($border-radius-base)
+
+.btn-group > .btn-group:last-child > .btn:first-child
+	@include border-right-radius(0)
+	@include border-left-radius($border-radius-base)