Partially fixes NB#78521
* src/maemo/modest-progress-bar-widget.c:
When the progress bar receives a "progress-changed" signal from its mail operation
where state->done = 0 and state->total = 0, it begins to pulse periodically until
the mail operation finishes or it receives a "progress-changed" signal with
positive values.
* (modest_progress_bar_widget_is_pulsating) :
* (modest_progress_bar_widget_set_pulsating_mode) : manage this pulsating mode
* src/modest-mail-operation.c
* (modest_mail_operation_update_account) :
* (modest_mail_operation_get_msg) :
* (modest_mail_operation_get_msgs_full) :
* (modest_mail_operation_refresh_folder) : these functions send an initial "progress-changed"
signal because it could happen that the first signal with "real" data takes a long time
to happen, or in some cases doesn't happen at all, leaving the user with an empty
progress bar for a while.
pmo-trunk-r3912