Merge pull request #8760 from yglukhov/diff-sticky-headers

Diff headers made sticky

app/assets/javascripts/application.js.coffee

@@ -16,6 +16,7 @@
 #= require jquery.scrollTo
 #= require jquery.blockUI
 #= require jquery.turbolinks
+#= require jquery.sticky-kit.min
 #= require turbolinks
 #= require autosave
 #= require bootstrap

app/assets/javascripts/diff.js.coffee

@@ -36,6 +36,8 @@ class @Diff
       )
     )
 
+    $('.diff-header').stick_in_parent(offset_top: $('.navbar').height())
+
   lineNumbers: (line) ->
     return ([0, 0]) unless line.children().length
     lines = line.children().slice(0, 2)

vendor/assets/javascripts/jquery.sticky-kit.min.js

+/*
+ Sticky-kit v1.1.1 | WTFPL | Leaf Corcoran 2014 | http://leafo.net
+*/
+(function(){var k,e;k=this.jQuery||window.jQuery;e=k(window);k.fn.stick_in_parent=function(d){var v,y,n,p,h,C,s,G,q,H;null==d&&(d={});s=d.sticky_class;y=d.inner_scrolling;C=d.recalc_every;h=d.parent;p=d.offset_top;n=d.spacer;v=d.bottoming;null==p&&(p=0);null==h&&(h=void 0);null==y&&(y=!0);null==s&&(s="is_stuck");null==v&&(v=!0);G=function(a,d,q,z,D,t,r,E){var u,F,m,A,c,f,B,w,x,g,b;if(!a.data("sticky_kit")){a.data("sticky_kit",!0);f=a.parent();null!=h&&(f=f.closest(h));if(!f.length)throw"failed to find stick parent";
+u=m=!1;(g=null!=n?n&&a.closest(n):k("<div />"))&&g.css("position",a.css("position"));B=function(){var c,e,l;if(!E&&(c=parseInt(f.css("border-top-width"),10),e=parseInt(f.css("padding-top"),10),d=parseInt(f.css("padding-bottom"),10),q=f.offset().top+c+e,z=f.height(),m&&(u=m=!1,null==n&&(a.insertAfter(g),g.detach()),a.css({position:"",top:"",width:"",bottom:""}).removeClass(s),l=!0),D=a.offset().top-parseInt(a.css("margin-top"),10)-p,t=a.outerHeight(!0),r=a.css("float"),g&&g.css({width:a.outerWidth(!0),
+height:t,display:a.css("display"),"vertical-align":a.css("vertical-align"),"float":r}),l))return b()};B();if(t!==z)return A=void 0,c=p,x=C,b=function(){var b,k,l,h;if(!E&&(null!=x&&(--x,0>=x&&(x=C,B())),l=e.scrollTop(),null!=A&&(k=l-A),A=l,m?(v&&(h=l+t+c>z+q,u&&!h&&(u=!1,a.css({position:"fixed",bottom:"",top:c}).trigger("sticky_kit:unbottom"))),l<D&&(m=!1,c=p,null==n&&("left"!==r&&"right"!==r||a.insertAfter(g),g.detach()),b={position:"",width:"",top:""},a.css(b).removeClass(s).trigger("sticky_kit:unstick")),
+y&&(b=e.height(),t+p>b&&!u&&(c-=k,c=Math.max(b-t,c),c=Math.min(p,c),m&&a.css({top:c+"px"})))):l>D&&(m=!0,b={position:"fixed",top:c},b.width="border-box"===a.css("box-sizing")?a.outerWidth()+"px":a.width()+"px",a.css(b).addClass(s),null==n&&(a.after(g),"left"!==r&&"right"!==r||g.append(a)),a.trigger("sticky_kit:stick")),m&&v&&(null==h&&(h=l+t+c>z+q),!u&&h)))return u=!0,"static"===f.css("position")&&f.css({position:"relative"}),a.css({position:"absolute",bottom:d,top:"auto"}).trigger("sticky_kit:bottom")},
+w=function(){B();return b()},F=function(){E=!0;e.off("touchmove",b);e.off("scroll",b);e.off("resize",w);k(document.body).off("sticky_kit:recalc",w);a.off("sticky_kit:detach",F);a.removeData("sticky_kit");a.css({position:"",bottom:"",top:"",width:""});f.position("position","");if(m)return null==n&&("left"!==r&&"right"!==r||a.insertAfter(g),g.remove()),a.removeClass(s)},e.on("touchmove",b),e.on("scroll",b),e.on("resize",w),k(document.body).on("sticky_kit:recalc",w),a.on("sticky_kit:detach",F),setTimeout(b,
+0)}};q=0;for(H=this.length;q<H;q++)d=this[q],G(k(d));return this}}).call(this);