No bug - Sort breakpoints by selected location. r=davidwalsh

Differential Revision: https://phabricator.services.mozilla.com/D23140

--HG--
extra : moz-landing-system : lando

devtools/client/debugger/new/src/selectors/breakpointSources.js

@@ -13,6 +13,7 @@ import {
 } from "../selectors";
 import { getFilename } from "../utils/source";
 import { getSelectedLocation } from "../utils/source-maps";
+import { sortSelectedBreakpoints } from "../utils/breakpoint";
 
 import type { Source, Breakpoint } from "../types";
 import type { Selector, SourcesMap } from "../reducers/types";
@@ -27,12 +28,7 @@ function getBreakpointsForSource(
   selectedSource: ?Source,
   breakpoints: Breakpoint[]
 ) {
-  return breakpoints
-    .sort(
-      (a, b) =>
-        getSelectedLocation(a, selectedSource).line -
-        getSelectedLocation(b, selectedSource).line
-    )
+  return sortSelectedBreakpoints(breakpoints, selectedSource)
     .filter(
       bp =>
         !bp.options.hidden &&

devtools/client/debugger/new/src/utils/breakpoint/index.js

@@ -232,7 +232,7 @@ export function getSelectedText(
 
 export function sortSelectedBreakpoints(
   breakpoints: Breakpoint[],
-  selectedSource: Source
+  selectedSource: ?Source
 ): Breakpoint[] {
   return sortBy(breakpoints, [
     // Priority: line number, undefined column, column number