Extracted from Pike v7.8 release 866 at 2016-11-06.
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GTK2
GTK2.FileChooser

Methods
 add_filter()
 add_shortcut_folder()
 add_shortcut_folder_uri()
 get_action()
 get_current_folder()
 get_current_folder_uri()
 get_do_overwrite_confirmation()
 get_extra_widget()
 get_filename()
 get_filenames()
 get_filter()
 get_local_only()
 get_preview_filename()
 get_preview_uri()
 get_preview_widget()
 get_preview_widget_active()
 get_select_multiple()
 get_show_hidden()
 get_uri()
 get_uris()
 get_use_preview_label()
 list_filters()
 list_shortcut_folder_uris()
 list_shortcut_folders()
 remove_filter()
 remove_shortcut_folder()
 remove_shortcut_folder_uri()
 select_all()
 select_filename()
 select_uri()
 set_action()
 set_current_folder()
 set_current_folder_uri()
 set_current_name()
 set_do_overwrite_confirmation()
 set_extra_widget()
 set_filename()
 set_filter()
 set_local_only()
 set_preview_widget()
 set_preview_widget_active()
 set_select_multiple()
 set_show_hidden()
 set_uri()
 set_use_preview_label()
 unselect_all()
 unselect_filename()
 unselect_uri()
previousGTK2.FileChooser()->set_current_name()
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Method GTK2.FileChooser()->set_do_overwrite_confirmation()

Method set_do_overwrite_confirmation

GTK2.FileChooser set_do_overwrite_confirmation(int setting)

Description

Sets whether a file chooser in GTK2.FILE_CHOOSER_ACTION_SAVE mode will present a confirmation dialog if the users types a file name that already exists. This is FALSE by default.

Regardless of this setting, the chooser will emit the "confirm-overwrite" signal when appropriate.

If all you need is the stock confirmation dialog, set this property to TRUE. You can override the way confirmation is done by actually handling the "confirm-overwrite" signal.