Week 7: Gradient Widget Review Fixes

This is a weekly update from my Google Summer of Code 2026 project with KDE, improving effect widgets in Kdenlive, a free and open source video editor. MR !911 opened and reviewed Opened the Gradient widget MR this week, closing issue #1064 and referencing #2206. Jean-Baptiste reviewed it and flagged a few things. Fixing the gradient render bug The gradient bar was rendering as a flat, empty rectangle, only the stop handles below it showed color. Root cause: the native QStyle::drawPrimitive(PE_…