Hope to provide titlebar drawing function. #56
Description
In order to change titlebar background color,I hope to provide titlebar drawing function as like ImWindow(https://github.com/thennequin/ImWindow.git branch:titlebar)
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In order to change titlebar background color,I hope to provide titlebar drawing function as like ImWindow(https://github.com/thennequin/ImWindow.git branch:titlebar)