In T8135#195971, @chad wrote:

@olivier-squid is the main issue people don't know it's going to happen, or that we just get it wrong. Will the headers help or are you expecting this to just not happen at all when you drag (ie, no sort changes happen at all).

@chad, T10333 may address this, but looks very complex for a very simple issue.
Believe me, everyone using phab in my company complained about the priorities being automatically changed.
Sorting by Priority is a very common/natural way of using boards.
You should at least propose a setting in Phab to disable this feature - this would make everyone happy.

Hi @chad , I'm talking about this issue : "drag & drop on a workboard sorted by priority behavior is surprising" which I understand to be the scenario where you move a task form a column to another in a board and if you're sorting by priority the task might have its priority changed depending on where on the column you drag it.
This behaviour in completely insane - I understand that someone may have thought of this being a shorthand - but it's a very bad idea to implement this behaviour by default.
Apart from this, Phab is awesome.

Could you please raise the priority of this issue? It's a daily nightmare for all folks here.

Ok the problem is fixed but not completely as only one of my batch task was executed :

1. add project "Sprint M43"
2. remove project "Sprint M42"

Here's the corresponding error log in /var/tmp/phd/log/daemons.log