Merge branch 'v4-flex-list-group' of https://github.com/rosskevin/bootstrap...

Merge branch 'v4-flex-list-group' of https://github.com/rosskevin/bootstrap into rosskevin-v4-flex-list-group

scss/_list-group.scss

@@ -3,6 +3,11 @@
 // Easily usable on <ul>, <ol>, or <div>.
 
 .list-group {
+  @if $enable-flex {
+    display: flex;
+    flex-direction: column;
+  }
+
   // No need to set list-style: none; since .list-group-item is block level
   padding-left: 0; // reset padding because ul and ol
   margin-bottom: 0;
@@ -14,8 +19,15 @@
 // Use on `li`s or `div`s within the `.list-group` parent.
 
 .list-group-item {
+  @if $enable-flex {
+    display: flex;
+    flex-flow: row wrap;
+    align-items: center;
+  } @else {
+    display: block;
+  }
+  
   position: relative;
-  display: block;
   padding: $list-group-item-padding-y $list-group-item-padding-x;
   // Place the border on the list items and negative margin up for better styling
   margin-bottom: -$list-group-border-width;