Unwanted borders when scaling UI with opaque components

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Interesting read. Just ran into the same problem.
About your workaround: Just be aware of this: if a component is setPaintingIsUnclipped(), it will always get repainted whenever its child is repainted!
So you might see worse UI performance.
See also this thread:

Unnecessary paints when parent is setPaintingIsUnclipped

I have 2 components : A and its child AA, both are opaque and setPaintingIsUnclipped (true). Everytime AA is repainted, the parent A is also repainted. Any reason for that? (If the parent is not setPaintingIsUnclipped, everything is ok) here is a simple code to reproduce (basic MainComponent for a projucer generated gui app) tested on 10.12 #ifndef MAINCOMPONENT_H_INCLUDED #define MAINCOMPONENT_H_INCLUDED #include "../JuceLibraryCode/JuceHeader.h" class ChildComponent : public Component, p…