Dark theme: Visibility problems with current colouring scheme (group colouring and scroll bars)

[AEgit]

JabRef 5.0.0-dev--2019-10-26----9fd49bcb2
Windows 10 10.0 amd64
Java 12.0.2

The current colour scheme employed for the Dark Theme, has a few problems (see also #5516). Among those are that the group colouration (indicating that the selected item was assigned to the coloured group) makes it sometimes impossible to see the number of assigned group items: Basically the green colour makes it impossible to see the underlying greyish to whitish colour of the item number.

Furthermore, the better visibility of scroll bars which was recently introduced (#5374; #5515) does not apply to the current dark theme (again due to the colouring scheme used for the scroll bars).

The following screenshots exemplify both problems. Maybe it would be worthwhile to have a separate label for problems that specifically just relate to the dark theme (since I reckon many users might not even be affected by them, since they use the default light theme).

[Siedlerchr]

Preview Panel in OpenOffice styles needs also to be adapted. Refs #5463
Select View -> OpenOffice/LibreOfice -> Select style

[Siedlerchr]

Preview in the preferences is also affected:

[Siedlerchr]

And there is another issue: Some textfields show the text with black color, but only white on hovering.
e.g. in the import tab

[tobiasdiez]

Thanks to @ageofadz this should be fixed in the latest development version. Could you please check the build from http://builds.jabref.org/master/. Thanks! Please remember to make a backup of your library before trying-out this version.

[AEgit]

JabRef 5.0.0-dev--2019-11-24----8780a5632
Windows 10 10.0 amd64
Java 13.0.1

While there have been changes, these have not addressed the issues reported here (completely):

1. The group colouration (indicating that the selected item was assigned to the coloured group) makes it still impossible to see the number of assigned group items. The colour has changed from green to greyish-white, but since the font colour is white, the numbers are still barely visible.

2. Similarly, the scroll bar is still basically invisible.

For 1) and 2) see:

3. The problem reported in Dark theme: Visibility problems with current colouring scheme (group colouring and scroll bars) #5522 (comment) also persists.

It should be relatively (?) straight-forward to fix problem (1) and (2): Just use a different colour for the group colouration and the scroll bars and the problem should be solved. Problem (3) might involved a bit more coding (?).

[AEgit]

Note, that there is another colouring problem. When you try to assign an item to a new group, using drag'n'drop, the respective group is coloured in pink, which also makes it nearly impossible to see the name of the group.

[AEgit]

@tobiasdiez I think this issue needs to be re-opened (see problems reported above).

[tobiasdiez]

@ageofadz do you have time to create a follow-up PR, which also fixes the remaining issues? That would be great! Let me know in case you are hitting a wall and need help navigating the code (although by now you should know where to look more or less).