[regression] Drag and drop inside dash is much slower/laggy with unity 6.0

[Andrea Azzarone]

No problem with unity 5.12 and/or 5.14.

[Daniel van Vugt (vanvugt)]

I suspect this might be caused by the fix for bug 865006. Unfortunately that's a very important fix because it's a prerequisite for regionalDamage, which will soon be back-ported to precise...
https://docs.google.com/a/canonical.com/document/d/1KHXFqhDX-MeS8NSwiYG4Qma4tYMCG4ch2xhqE4k-w2Q/edit

[Daniel van Vugt (vanvugt)]

The real problem is that Unity can't distinguish between damage occurring behind or in front of the active blur. So it just has to assume it's behind and update the active blur which is painfully slow.

[Daniel van Vugt (vanvugt)]

Although, the aforementioned blur fix would not cause this until the new damage logic was added. So I think that makes this another regionalDamage regression.

[Daniel van Vugt (vanvugt)]

I wonder if we could do another simple fix similar to:
https://code.launchpad.net/~vanvugt/unity/fastDash/+merge/113847

[Nice Testhouse (testhouse)]

Same issue observed in week 34 is reported as bug # 1040041
As requested, all further updates to the same issue will be added here and not in the above bug #.

Week 35- Same issue observed on Ubuntu 12.10 Quantal with ppa:unity-team/release

[Nice Testhouse (testhouse)]

Week 36 - Same issue observed on ubuntu 12.04 Precise with ppa:unity-team/sru. Clearly visible delay and the graphics is not smooth.

[Nice Testhouse (testhouse)]

Week 37 - Same issue observed on ubuntu 12.10 Quantal with ppa:unity-team/staging

[Nice Testhouse (testhouse)]

Week 38 - Same issue observed on ubuntu 12.10 Quantal with ppa:unity-team/staging

[Nice Testhouse (testhouse)]

Week 40 - same issue observed on ubuntu 12.10 Quantal with ppa:unity-team/ppa

Clearly visible delay observed between the object being dragged and the mouse pointer.

[Nice Testhouse (testhouse)]

Week 40 - Same issue observed on Ubuntu Chinese Edition 12.10 (Quantal Quetzal) Daily Build

[Nice Testhouse (testhouse)]

Week 46- Same issue observed on Ubuntu 12.04 Precise with ppa:unity-team/sru (Nvidia).

[Nice Testhouse (testhouse)]

Week 49- Same issue observed on Ubuntu 12.10 Quantal with ppa:unity-team/sru (Radeon).

[Nice Testhouse (testhouse)]

Week 50 - Same issue observed on Ubuntu 12.04 Precise with ppa:unity-team/sru on all 3 (Intel, Nvidia, Radeon).

Issue:- While dragging an item over dash, the item attached to the mouse does not move at the same speed as the mouse pointer and there is a visible delay.

Note: Dragging items on desktop works ok with no delay, delay is seen only when dragging is performed on dash

[Andrea Azzarone (azzar1)]

Seems fine in 14.04.