Use "update" method to initialize Qt Figures (cleanup + bug #46086) * Figure.cc (Figure::Figure): call "update" method on "windowbuttonmotionfcn" property to decide wether to update currentpoint and execute the function. * Figure.cc (Figure::Figure): call "update" method to avoid duplicate code for "visible", "keypresfcn" and "keyreleasefcn" properties. * Figure.cc (Figure::Figure): don't enable mouse tracking twice * Figure.cc (Figure::Figure): remove left-over debug comments

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