While drawing I noticed that after applying some filters and modifying with selection an edge popped up along many lines. How do I avoid or fix it?
Edit: found a solution! Instead of having the semi-transparent blue layer above the lines, selecting the lines and bucket erasing, simply move the layer below the lines and, if you've already made my mistake, color In the weird edges. Stupid problems require stupid solutions I guess
I don't think you're giving enough information for a proper solution.
I'm not very familiar with Krita per se, but this could be an artifact left by a sharpening filter, or more likely a result of a paint bucket or magic wand selection. Those dont do well with edges that have blended with the underlying color.
All of these can be avoided by using different layers for these overlapping elements.
More accustomed to Clip v1, but the solution there is usually bucket filling (refer to other layers) on a different layer, then expanding the selection of that fill by a few pixels to close in the gaps!
I'm looking forward to trying Krita on Android for mobile use, but most recent reviews seem rather mixed.