1284244 - [e10s][Linux] No more tab preview after dragging & dropping a tab in the title bar

Status: NEW

(Firefox :: Tabbed Browser, defect, P3)

Description

[Paul Silaghi, QA [:pauly]]

[Affected versions]:
- 50.0a1 (2016-07-03), 49.0a2 (2016-07-04), 48b5

[Affected platforms]:
- Ubuntu 14.04

[Steps to reproduce]:
1. Open several tabs
2. Drag and drop a tab in the title bar (above itself)
3. Drag a tab in the tab bar

[Expected result]:
- Tab preview displayed properly

[Actual result]:
- No more tab preview

[Regression range]:
- TBD, doesn't repro on 47.0.1

[Additional notes]:
- linux only

Comment 1

[Mike Conley (:mconley) (:⚙️) (PTO: May 24 - June 2nd)]

Probably worth testing to see if this is reproducible with e10s both on and off.

Comment 2

[Justin Dolske [:Dolske]]

This is somewhat of a primary UI mechanism (and a regression), so I don't think it's a P5.

Comment 3

[Paul Silaghi, QA [:pauly]]

Actually this is only reproducible with e10s ON.
On nightly 2015-01-01 there is no tab preview at all, e10s ON.
On nightly 2016-02-01, this bug reproduces.
So, I'm not sure if tab preview has ever worked properly.

Comment 4

[Mike Conley (:mconley) (:⚙️) (PTO: May 24 - June 2nd)]

Set the tracking-e10s flag pretty much out of habit. We're still triaging, so we'll see what the team thinks on Thursday.

Comment 5

[Sylvestre Ledru [:Sylvestre]]

Moving to p3 because no activity for at least 1 year(s).
See https://github.com/mozilla/bug-handling/blob/master/policy/triage-bugzilla.md#how-do-you-triage for more information