[16.0][IMP] web_timeline: Handle inverted date ranges

[houzefa-abba]

Inverted dates make no functional sense, but when they do happen, this change allows displaying them as single points in the timeline (same as when begin=end).

We currently do have such demo data when installing project_timeline:

Before: office design tasks are missing

After: office design tasks are shown

[OCA-git-bot]

Hi @tarteo,
some modules you are maintaining are being modified, check this out!

[pedrobaeza]

I don't get the concept of "inverted date".

[houzefa-abba]

I don't get the concept of "inverted date".

Sorry I wasn't clear enough; this is when end date is before start date (in my example, March 21st ➔ March 19th).

Makes no sense, but at least with this change they won't be completely hidden.

[pedrobaeza]

I think that should be forbidden by a constraint (SQL or Python).

[pedrobaeza]

But the constraint in project_timeline should be added IMO.

[houzefa-abba]

But the constraint in project_timeline should be added IMO.

Yes constraint and demo data, because demo data produces these "reversed dates"

I'll look into it soon

[houzefa-abba]

But the constraint in project_timeline should be added IMO.

Yes constraint and demo data, because demo data produces these "reversed dates"

I'll look into it soon

Done with OCA/project#1259 & OCA/project#1260