Caller returns the function nFrames above it on the call stack.
Passing 3 as nFrames will return the details of the function
invoking the function in which caller was invoked. This can help
determine which of several code paths were taken to reach a
particular place in the code.
Gtx will draw a thin, translucent, red rectangle at the gtx's max constraints and a
similar thin, blue rectangle at the minimum constraints. It is best used deferred, to ensure
the rectangles appear atop other widget content.
Sz draws a thing, translucent, green rectangle at the size of the given widget. It is designed
to easily wrap invocations of layout and pass through the dimensions.
Documentation
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