Omg, it had a null check all along! Problem solved 🙂 🙂
I moved the button to the bottom, and nope, it doesn’t feel right. It is good when there are a small number of variables, but when there are many vars you have to scroll down in search of that button 🙂 🙂 Now I think button on top is better, just needs clearer separation for graph variable button, and tabs for blackboard/graph variables might help with this, also it will make height of vars window smaller, more visibility is always good, i love tabs idea! But it needs actual UX testing if it feels right. Because I thought the “Add variable” button in the bottom was a good idea until I tested it 🙂 🙂
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