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GtkAdjustment::clamp_page

void clamp_page(double lower, double upper);

Updates the GtkAdjustment value to ensure that the range between lower and upper is in the current page (i.e. between value and value + page_size). If the range is larger than the page size, then only the start of it will be in the current page. A "changed" signal will be emitted if the value is changed.