DevTools: update console viewport scroll when prompt is resized

third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js

Index: third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js
diff --git a/third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js b/third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js
index 6b8f50f9c2939558001c6a6dcd02c3e1324c325b..d5926093093cde23d5d0a954323c8fa064e1f933 100644
--- a/third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js
+++ b/third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js
@@ -44,6 +44,13 @@ Console.ConsolePrompt = class extends UI.Widget {
   }
 
   /**
+   * @override
+   */
+  onLayout() {
+    this.invalidateSize();

[pfeldman, 2016/12/13 20:06:39]

What is the semantics of this code? When do you get layed out and how can you
request re-layout upon that signal?

[luoe, 2016/12/13 20:29:55]

Semantics are as follows: user changes the height of the prompt by pressing up
to load multiline text from history.  CodeMirrorTextEditor (CMTE)'s "changes"
event fires, and invalidateSize() triggers a chain of onLayout's:
CMTE > ConsolePrompt > SearchableView > ConsoleView

Only CMTE knows when it resizes itself and only ConsoleView knows how to update
its viewport.  Setting up this chain is one way to request the layout.

What this really is is a way to say: 'when the viewport's scrollHeight changes,
update the viewport' without checking differences in scrollHeight.

+  }
+
+  /**
    * @return {!Console.ConsoleHistoryManager}
    */
   history() {