indicator-datetime does not have color squares for different calendars and dates from contacts (birthdays & anniversaries)

[Norbert]

Steps to reproduce:
1. Install Ubuntu with `indicator-datetime` and `evolution`
2. Add event to *Personal* calendar (default color)
3. Add new calendar and name it for example *Work* (red color)
4. Create contact with two dates - birthday and anniversary (it is pink color)

Expected results:
* `indicator-datetime` show four coloured events as it was in Ubuntu 12.04 LTS (see screenshot - ubuntu-12-04.png)

Actual results:
* `indicator-datetime` show for event without color squares in the left of them (see screenshot - ubuntu-19-10.png)

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: indicator-datetime 15.10+19.10.20190507-0ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-14.15-generic 5.0.6
Uname: Linux 5.0.0-14-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: MATE
Date: Sun May 12 14:54:43 2019
InstallationDate: Installed on 2019-04-28 (13 days ago)
InstallationMedia: Ubuntu-MATE 19.10 "Eoan EANIMAL" - Alpha amd64 (20190426)
SourcePackage: indicator-datetime
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

Seems to be regression.

[Khurshid Alam (khurshid-alam)]

Why this is relevant in 19.10 ? Trusty already had eol.

Indicator-datetime was ported from C to C++ (r: 298) to work with unity-8 and that feature gone missing with that. But there is no unity-8 anymore and the code doesn't work.

[Norbert (nrbrtx)]

There are color squares in Ubuntu 12.04 LTS for both GTK2 and GTK3 versions of `indicator-datetime`.
Squares are in place on 12.10, 13.04, 13.10.

There are no color squares in Ubuntu 14.04 LTS. So it first release without them.

@Krusrshid, on Ubuntu MATE 19.10 we plan to use `indicator-datetime`.

[Khurshid Alam (khurshid-alam)]

By "we" do you mean official ubuntu-mate team ? In that case, contact me on community.ubuntu.com.

Indicator-datetime requires lots of changes including the upcoming api break from eds. Someone from community proposed to remove phone realted code and go back to c. Not sure if it is still possible.

[Norbert (nrbrtx)]

Ubuntu MATE 21.04 LTS is affected with its new ayatana-indicator-datetime .

[Norbert (nrbrtx)]

Reported upstream as https://github.com/AyatanaIndicators/ayatana-indicator-datetime/issues/26

[Martin Wimpress  (flexiondotorg)]

Fixed since ayatana-indicator-datetime 2.1.1-2 in Ubuntu MATE 21.10

[Norbert (nrbrtx)]

Bug does not exist in Ubuntu MATE 22.04 LTS. Thanks to ayatana-indicator-datetime!