1415907 - Not all Top Sites and Highlights show their correct image preview when dragged

Status: NEW

(Firefox :: New Tab Page, defect, P3)

Description

[Ciprian Muresan [:cmuresan], Formerly of Ecosystem QA - please needinfo @mcoman for things regarding the team]

Attachment: missing preview when dragging a top site or highlight.gif

[Affected versions]:
- Firefox 58.0a1 Build ID 20171108110838

[Affected Platforms]:
- All Windows
- All Mac
- All Linux

[Prerequisites]:
- Have a clean new profile.
- Have a sync account with enough History and Bookmarks to populate the sections.

[Steps to reproduce]:
1. Open the browser with the profile from prerequisites and sync your history.
2. Restart the browser and open a new tab.
3. Wait for Top Sites to load images.
4. Drag all the Top Sites and observe their previews.

[Expected results]:
- The Top Site images are shown as a drag previews.

[Actual results]:
- Some Top Sites show a white preview.

[Notes]:
- The issue is also reproducible when dragging Highlights.
- If you drag the tiles a second time they will show their correct image preview.
- Attached a screen recording of the issue.

Comment 1

[Andrei Oprea [:andreio]]

The recent work on drag and drop seems to have fixed this issue. Can you please confirm?

Comment 2

[Ciprian Muresan [:cmuresan], Formerly of Ecosystem QA - please needinfo @mcoman for things regarding the team]

The issue is still reproducible on the latest Nightly 60.0a1 Build ID 20180129220114 on Windows 10 x64, Mac 10.13 and Arch Linux x64. 
It seems this happens most often on new profiles with synchronized or imported history.

Comment 3

[Ricky Rosario [:rrosario, :r1cky]]

I've found a way to consistently reproduce this on OS-X.

1- open New Tab page
2- minimize the window
3- wait a few minutes
4- bring the window back and drag a Top Site

It only seems to happen to screenshots.

Now I guess I need play with the CSS and hopefully find some workaround.