DevTools: only hide breakpoint editor on external blurs

When opening the breakpoint editor and clicking on already-selected
text, focus can move from CodeMirror's scroller to its textarea.
This internal blur should not trigger a commit.

Screenshot: https://imgur.com/a/kzyWLYj

Bug: none
Change-Id: I096692aaf5fe38104e80c8628dee28d9ba21d2c5
Reviewed-on: https://chromium-review.googlesource.com/1181651Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Erik Luo <luoe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584663}

third_party/blink/renderer/devtools/front_end/sources/DebuggerPlugin.js

@@ -667,9 +667,6 @@ Sources.DebuggerPlugin = class extends Sources.UISourceCodeFrame.Plugin {
     editor.widget().element.addEventListener('keydown', async event => {
       if (isEnterKey(event) && !event.shiftKey) {
         event.consume(true);
-        if (event.ctrlKey)
-
-          event.consume(true);
         const expression = editor.text();
         if (event.ctrlKey || await ObjectUI.JavaScriptAutocomplete.isExpressionComplete(expression))
           finishEditing.call(this, true);
@@ -682,7 +679,8 @@ Sources.DebuggerPlugin = class extends Sources.UISourceCodeFrame.Plugin {
     editor.widget().focus();
     editor.widget().element.id = 'source-frame-breakpoint-condition';
     editor.widget().element.addEventListener('blur', event => {
-      finishEditing.call(this, true);
+      if (event.relatedTarget && !event.relatedTarget.isSelfOrDescendant(editor.widget().element))
+        finishEditing.call(this, true);
     }, true);
     let finished = false;
     /**