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ColorButton: add new signal dialog-open

This signal is intendet to be used to modify something before the colorpicker dialog gets opend. For example close a popover before the dialog shows up.

fixes #4766 (closed)

Some points that need to be discussed:

  • Makes the name sense?
  • Is there maybe a more general approach, like derive GtkColorButton from GtkButton and instead use the clicked signal?
  • pass the color dialog as a argument, allow modification?

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