automatic color adjustments should take place based on the selected theme color

[j-ed]

Expected behavior

Depending on the selected theme color the notification alert color, and maybe others, should automatically be adjusted to be still visible.

Current behavior

No automatic color adjustments seems to take place at all.

Steps to reproduce

1. Open the admin settings.

2. Change the theming color to FF0000.
   

3. Check the notification symbol in the menu bar
   

4. The notification alert is nearly invisible.

Better visibility could look like this:

Environment

Server Configuration

OS: Linux 3.16.50
Web server: Apache2 2.4.29
Database: MariaDB 10.0.32
PHP version: 5.6.29
Nextcloud version: 12.0.4

Client Configuration

Browser: Mozilla Firefox 57.0.2
Operating system: Windows 7

[MorrisJobke]

@nextcloud/designers @nextcloud/theming I guess that is as of now not easily possible, right?

[juliusknorr]

I guess the issue is not only #ff0000 but also other red color values as well, so we need a wider check for that.

@j-ed That issue should be addressed in the notifications app. Can you please open the issue at https://github.com/nextcloud/notifications