flamegraph: Clean up flameGraph.css patch (2)

Follows-up 0ff9af8.

* Move the overrides to xhgui.css instead.
* Given the complexity of these overrides, don't try to undo
  each original style, but simply document that all
  d3-flame-graph-tip styles should be omitted when updating.
* Document the d3.flameGraph.js patch.

* Add ignore for pre-existing issues with csslint. Since
  sticker-ci was enabled without passing on current code first.
  Also, these issues are false negatives, and are bugs in csslint,
  not bugs in xhgui code.

Ref #211.

.stickler.yml

@@ -1,7 +1,8 @@
 linters:
   phpcs:
     standard: PSR2
-  csslint: {  }
+  csslint:
+    ignore: 'ids,known-properties'
 files:
   ignore:
     - 'bower_components/*'

webroot/css/d3.flameGraph.css

@@ -38,43 +38,7 @@
   background: transparent;
 }
 
-.d3-flame-graph-tip {
-  line-height: 1;
-  font-family: Verdana;
-  font-size: 12px;
-  padding: 12px;
-  background: #fff;
-  border-radius: 6px;
-  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
-  border: 1px solid rgba(0, 0, 0, 0.2);
-  color: #000;
-  pointer-events: none;
-}
-
-/* Creates a small triangle extender for the tooltip */
-.d3-flame-graph-tip:before,
-.d3-flame-graph-tip:after {
-    pointer-events: none;
-    content: '';
-    position: absolute;
-    display: block;
-    width: 0;
-    height: 0;
-    border-width: 11px;
-    border-color: transparent;
-    border-style: solid;
-    left: 50%;
-    z-index: 2;
-}
-.d3-flame-graph-tip:after {
-    border-bottom-color: #fff;
-    margin-left: -11px;
-    top: -22px;
-    z-index: 2;
-}
-.d3-flame-graph-tip:before {
-    border-width: 12px;
-    border-bottom-color: #999;
-    margin-left: -12px;
-    top: -24px;
-}
+/**
+ * PATCH(xhgui): Remove all .d3-flame-graph-tip styles
+ * We have our own tip styles in xhgui.css instead.
+ */

webroot/css/xhgui.css

@@ -393,12 +393,46 @@ body .d3-flame-graph .frame:hover .label {
     color: #fff;
 }
 
-/* Inherit our font style instead of hardcoded Verdana 12px */
-body .d3-flame-graph-tip {
-  font-family: inherit;
-  font-size: inherit;
+.d3-flame-graph-tip {
+  line-height: 1;
+  padding: 12px;
+  background: #fff;
+  border-radius: 6px;
+  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+  border: 1px solid rgba(0, 0, 0, 0.2);
+  color: #000;
+  pointer-events: none;
 }
 
+/* Creates a small triangle extender for the tooltip */
+.d3-flame-graph-tip:before,
+.d3-flame-graph-tip:after {
+  pointer-events: none;
+  content: '';
+  position: absolute;
+  display: block;
+  width: 0;
+  height: 0;
+  border-width: 11px;
+  border-color: transparent;
+  border-style: solid;
+  left: 50%;
+  z-index: 2;
+}
+.d3-flame-graph-tip:after {
+  border-bottom-color: #fff;
+  margin-left: -11px;
+  top: -22px;
+  z-index: 2;
+}
+.d3-flame-graph-tip:before {
+  border-width: 12px;
+  border-bottom-color: #999;
+  margin-left: -12px;
+  top: -24px;
+}
+
+
 /**
  * Run details
  */

webroot/js/d3.flameGraph.js

@@ -15,6 +15,7 @@
 
     var tip = d3.tip()
       .direction("s")
+      // PATCH(xhgui): Override offset from 8 to 24.
       .offset([24, 0])
       .attr('class', 'd3-flame-graph-tip')
       .html(function(d) { return label(d); });