Set the current window size.
size
Window width and height in pixels; 0 on an axis requests automatic fitting.
cond
ImGuiCond controlling when the state is applied; 0 means always.
(not recommended) set current window size - call within Begin()/End().
set to { x: 0, y: 0 } to force an auto-fit.
prefer using SetNextWindowSize(), as this may incur tearing and minor side-effects.
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Set the current window size.