Alt click on a node connection automatically disconnect it from the other nodes. And there is some nodes which can be easily summoned by pressing a key and clicking at the same time. Like B+click will place a branch, and S+click a sequence.
If you're willing to compile it, Aseprite is a great option as well.
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LibGDX Tutorial: Dealing With Multiple Device Resolutions
Learn about how to work with multiple resolutions as aspect ratios using Viewports and Cameras in LibGDX. It describes the many types of available cameras, rendering with a camera and setting your game world up to use your own coordinates instead of pixels.
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