Ensure that planner warnings get shown before calculations are run

Linus pointed out that the warning wasn't shown until the main loop got
control back, so even a gtk_widget_show_all() doesn't really help to make
sure that things are shown right then.

This commit adds a little loop to handle all pending gtk_events before
exiting the show_error() function. Now the warning should be shown BEFORE
a potentially slow calculation gets started.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/planner.c b/planner.c
index 0e9725b55..245cb1bbb 100644
--- a/planner.c
+++ b/planner.c
@@ -83,6 +83,9 @@ static void show_error(const char *fmt, ...)
 	if (!bar_is_visible)
 		gtk_box_pack_start(GTK_BOX(box), planner_error_bar, FALSE, FALSE, 0);
 	gtk_widget_show_all(box);
+	/* make sure this actually gets shown BEFORE the calculations run */
+	while (gtk_events_pending())
+		gtk_main_iteration_do(FALSE);
 }
 
 void get_gas_from_events(struct divecomputer *dc, int time, int *o2, int *he)