Upgrade Bootstrap to v4.6.0

css/bootstrap/_alert.scss

@@ -27,13 +27,14 @@
 // Expand the right padding and account for the close button's positioning.
 
 .alert-dismissible {
-  padding-right: ($close-font-size + $alert-padding-x * 2);
+  padding-right: $close-font-size + $alert-padding-x * 2;
 
   // Adjust close link position
   .close {
     position: absolute;
     top: 0;
     right: 0;
+    z-index: 2;
     padding: $alert-padding-y $alert-padding-x;
     color: inherit;
   }

css/bootstrap/_badge.scss

@@ -6,13 +6,20 @@
 .badge {
   display: inline-block;
   padding: $badge-padding-y $badge-padding-x;
-  font-size: $badge-font-size;
+  @include font-size($badge-font-size);
   font-weight: $badge-font-weight;
   line-height: 1;
   text-align: center;
   white-space: nowrap;
   vertical-align: baseline;
   @include border-radius($badge-border-radius);
+  @include transition($badge-transition);
+
+  @at-root a#{&} {
+    @include hover-focus() {
+      text-decoration: none;
+    }
+  }
 
   // Empty badges collapse automatically
   &:empty {

css/bootstrap/_breadcrumb.scss

@@ -3,6 +3,7 @@
   flex-wrap: wrap;
   padding: $breadcrumb-padding-y $breadcrumb-padding-x;
   margin-bottom: $breadcrumb-margin-bottom;
+  @include font-size($breadcrumb-font-size);
   list-style: none;
   background-color: $breadcrumb-bg;
   @include border-radius($breadcrumb-border-radius);
@@ -14,10 +15,10 @@
     padding-left: $breadcrumb-item-padding;
 
     &::before {
-      display: inline-block; // Suppress underlining of the separator in modern browsers
+      float: left; // Suppress inline spacings and underlining of the separator
       padding-right: $breadcrumb-item-padding;
       color: $breadcrumb-divider-color;
-      content: $breadcrumb-divider;
+      content: escape-svg($breadcrumb-divider);
     }
   }
 

css/bootstrap/_button-group.scss

@@ -9,11 +9,11 @@
 
   > .btn {
     position: relative;
-    flex: 0 1 auto;
+    flex: 1 1 auto;
 
     // Bring the hover, focused, and "active" buttons to the front to overlay
     // the borders properly
-    @include hover {
+    @include hover() {
       z-index: 1;
     }
     &:focus,
@@ -22,14 +22,6 @@
       z-index: 1;
     }
   }
-
-  // Prevent double borders when buttons are next to each other
-  .btn + .btn,
-  .btn + .btn-group,
-  .btn-group + .btn,
-  .btn-group + .btn-group {
-    margin-left: -$btn-border-width;
-  }
 }
 
 // Optional: Group multiple button groups together for a toolbar
@@ -44,8 +36,10 @@
 }
 
 .btn-group {
-  > .btn:first-child {
-    margin-left: 0;
+  // Prevent double borders when buttons are next to each other
+  > .btn:not(:first-child),
+  > .btn-group:not(:first-child) {
+    margin-left: -$btn-border-width;
   }
 
   // Reset rounded corners
@@ -119,17 +113,14 @@
   align-items: flex-start;
   justify-content: center;
 
-  .btn,
-  .btn-group {
+  > .btn,
+  > .btn-group {
     width: 100%;
   }
 
-  > .btn + .btn,
-  > .btn + .btn-group,
-  > .btn-group + .btn,
-  > .btn-group + .btn-group {
+  > .btn:not(:first-child),
+  > .btn-group:not(:first-child) {
     margin-top: -$btn-border-width;
-    margin-left: 0;
   }
 
   // Reset rounded corners

css/bootstrap/_buttons.scss

@@ -6,17 +6,21 @@
 
 .btn {
   display: inline-block;
+  font-family: $btn-font-family;
   font-weight: $btn-font-weight;
+  color: $body-color;
   text-align: center;
-  white-space: nowrap;
+  text-decoration: if($link-decoration == none, null, none);
+  white-space: $btn-white-space;
   vertical-align: middle;
   user-select: none;
+  background-color: transparent;
   border: $btn-border-width solid transparent;
-  @include button-size($btn-padding-y, $btn-padding-x, $font-size-base, $btn-line-height, $btn-border-radius);
+  @include button-size($btn-padding-y, $btn-padding-x, $btn-font-size, $btn-line-height, $btn-border-radius);
   @include transition($btn-transition);
 
-  // Share hover and focus styles
-  @include hover-focus {
+  @include hover() {
+    color: $body-color;
     text-decoration: none;
   }
 
@@ -33,17 +37,16 @@
     @include box-shadow(none);
   }
 
-  // Opinionated: add "hand" cursor to non-disabled .btn elements
   &:not(:disabled):not(.disabled) {
-    cursor: pointer;
-  }
+    cursor: if($enable-pointer-cursor-for-buttons, pointer, null);
 
-  &:not(:disabled):not(.disabled):active,
-  &:not(:disabled):not(.disabled).active {
-    @include box-shadow($btn-active-box-shadow);
+    &:active,
+    &.active {
+      @include box-shadow($btn-active-box-shadow);
 
-    &:focus {
-      @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);
+      &:focus {
+        @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);
+      }
     }
   }
 }
@@ -80,20 +83,16 @@ fieldset:disabled a.btn {
 .btn-link {
   font-weight: $font-weight-normal;
   color: $link-color;
-  background-color: transparent;
+  text-decoration: $link-decoration;
 
-  @include hover {
+  @include hover() {
     color: $link-hover-color;
     text-decoration: $link-hover-decoration;
-    background-color: transparent;
-    border-color: transparent;
   }
 
   &:focus,
   &.focus {
     text-decoration: $link-hover-decoration;
-    border-color: transparent;
-    box-shadow: none;
   }
 
   &:disabled,
@@ -111,11 +110,11 @@ fieldset:disabled a.btn {
 //
 
 .btn-lg {
-  @include button-size($btn-padding-y-lg, $btn-padding-x-lg, $font-size-lg, $btn-line-height-lg, $btn-border-radius-lg);
+  @include button-size($btn-padding-y-lg, $btn-padding-x-lg, $btn-font-size-lg, $btn-line-height-lg, $btn-border-radius-lg);
 }
 
 .btn-sm {
-  @include button-size($btn-padding-y-sm, $btn-padding-x-sm, $font-size-sm, $btn-line-height-sm, $btn-border-radius-sm);
+  @include button-size($btn-padding-y-sm, $btn-padding-x-sm, $btn-font-size-sm, $btn-line-height-sm, $btn-border-radius-sm);
 }