Web Inspector: Clicking on Clear Network Items icon throws an exception if timing popover is visible

[Nikita Vasilyev]

Uncaught Exceptions:
 - TypeError: null is not an object (evaluating 'this.dataGrid._popover') (at ResourceTimelineDataGridNode.js:424:82)
    ? @ ResourceTimelineDataGridNode.js:424:82

* STEPS TO REPRODUCE
1. In Web Inspector, open Network tab
2. Open http://webkit.org/
3. Hover over the timing bar at the right side of the content view to show the timing information popover.
4. Quickly click on the Clear Network Items icon.

[Radar WebKit Bug Importer]

<rdar://problem/31132652>

[Nikita Vasilyev]

Created attachment 304879 [details]
Patch

[Joseph Pecoraro]

Comment on attachment 304879 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=304879&action=review

r=me

> Source/WebInspectorUI/UserInterface/Views/ResourceTimelineDataGridNode.js:430
> +            let dismissPopover = () => {
> +                if (this.dataGrid)
> +                    this.dataGrid._popover.dismiss();
> +            };
> +
> +            this.dataGrid._dismissPopoverTimeout = setTimeout(dismissPopover, WebInspector.ResourceTimelineDataGridNode.DelayedPopoverDismissalTimeout);

Style: We normally inline arrow functions used in only one place:

    this.dataGrid._dismissPopoverTimeout = setTimeout(() => {
        if (this.dataGrid)
            this.dataGrid._popover.dismiss();
    }, WebInspector.ResourceTimelineDataGridNode.DelayedPopoverDismissalTimeout);

[Nikita Vasilyev]

Created attachment 304974 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 304974 [details]
Patch

Clearing flags on attachment: 304974

Committed r214199: <http://trac.webkit.org/changeset/214199>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.