grunt

dist/js/bootstrap.js

@@ -1050,8 +1050,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
   }
 
   Modal.prototype.checkScrollbar = function () {
-    if (document.body.clientWidth >= window.innerWidth) return
-    this.scrollbarWidth = this.scrollbarWidth || this.measureScrollbar()
+    this.scrollbarWidth = this.measureScrollbar()
   }
 
   Modal.prototype.setScrollbar = function () {
@@ -1064,6 +1063,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
   }
 
   Modal.prototype.measureScrollbar = function () { // thx walsh
+    if (document.body.clientWidth >= window.innerWidth) return 0
     var scrollDiv = document.createElement('div')
     scrollDiv.className = 'modal-scrollbar-measure'
     this.$body.append(scrollDiv)

docs/dist/js/bootstrap.js

@@ -1050,8 +1050,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
   }
 
   Modal.prototype.checkScrollbar = function () {
-    if (document.body.clientWidth >= window.innerWidth) return
-    this.scrollbarWidth = this.scrollbarWidth || this.measureScrollbar()
+    this.scrollbarWidth = this.measureScrollbar()
   }
 
   Modal.prototype.setScrollbar = function () {
@@ -1064,6 +1063,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
   }
 
   Modal.prototype.measureScrollbar = function () { // thx walsh
+    if (document.body.clientWidth >= window.innerWidth) return 0
     var scrollDiv = document.createElement('div')
     scrollDiv.className = 'modal-scrollbar-measure'
     this.$body.append(scrollDiv)