Implement review comment changes for PR spiermar#155 Issue spiermar#144…

… - Keep default behaviour as case-sensitive

README.md

@@ -307,7 +307,7 @@ If called with no arguments, `setColorMapper` will reset the color hash function
 <a name="setSearchMatch" href="#setSearchMatch">#</a> flamegraph.<b>setSearchMatch</b>(<i>[function]</i>)
 
 Replaces the built-in node search match function. Function takes three arguments,
-the node data structure, the search term and an optional boolean argument for case-sensitive search. If the third argument is not provided, the search will not be case-sensitive. It must return a boolean. Example:
+the node data structure, the search term and an optional boolean argument to ignore case during search. If the third argument is not provided, the search will be case-sensitive by default. The function must return a boolean. Example:
 
 ```js
 flamegraph.setSearchMatch(function(d, term, true) {

src/flamegraph.js

@@ -63,12 +63,12 @@ export default function () {
     }
     var originalSearchHandler = searchHandler
 
-    let searchMatch = (d, term, caseSensitive = false) => {
+    let searchMatch = (d, term, ignoreCase = false) => {
         if (!term) {
             return false
         }
         let label = getName(d)
-        if (!caseSensitive) {
+        if (ignoreCase) {
             term = term.toLowerCase()
             label = label.toLowerCase()
         }