I'll get this fixed in the next release. Thanks for reporting!
I know its a minor bug but it gets me every single time I open the app and it hasn't been fixed yet.
The next release should hopefully be completed next week and ready for submission to Apple.
This is where being colour blind makes things trickier - I'm terrible at spotting these sorts of issues, I had thought it was fixed but obviously not.
To help me fix this once and for all could you provide some very clear reproducible steps I can take to see this happening (I'll use a digital colour metre to pinpoint where this is going wrong). For example:
1. The app is already configured to have Dark Mode on and I open the app so that it launches rather than comes in from the background
2. I tap on the TODO tab
3. I tap on the Search icon top left
4. The colour is incorrect
5. I tap on the Files tab
6. I come back to the TODO tab
7. The colour is now correct
If you could also include the device you are experiencing this on and version of iOS.
iPhone X iOS 12.1.4
Thank you for the additional detail. The step I was previously missing was using scroll to reveal the search bar. I have now fixed this (99% sure anyway!) and you'll see this resolved in 2.12.0 which I hope to release next week if testing goes well.