[gnome-calendar] week-grid: fix event creation on RTL languages

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 2f2867179d7c18ccb7f12eef0c553d40fbe5c4b0
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Mar 28 23:57:17 2017 -0300

    week-grid: fix event creation on RTL languages
    
    On RTL languages, the calcs to detect the start and end
    of the new event were wrong, leading to the weird behavior
    it currently has.
    
    Fix that by correctly calculating the start and end cells
    on RTL languages.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777429

 src/views/gcal-week-grid.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/src/views/gcal-week-grid.c b/src/views/gcal-week-grid.c
index 3b7284e..126a33b 100644
--- a/src/views/gcal-week-grid.c
+++ b/src/views/gcal-week-grid.c
@@ -913,8 +913,15 @@ gcal_week_grid_button_release (GtkWidget      *widget,
     }
   else
     {
-      start = g_date_time_add_minutes (week_start, MAX_MINUTES - column * MINUTES_PER_DAY + minute);
-      end = g_date_time_add_minutes (week_start, MAX_MINUTES - column * MINUTES_PER_DAY + (end_cell + 1) * 
30);
+      guint rtl_start_cell, rtl_end_cell, rtl_column;
+
+      /* Fix the minute */
+      rtl_column = 6 - column;
+      rtl_start_cell = start_cell + (rtl_column - column) * 48;
+      rtl_end_cell = (rtl_column * MINUTES_PER_DAY + minute) / 30;
+
+      start = g_date_time_add_minutes (week_start, rtl_start_cell * 30);
+      end = g_date_time_add_minutes (week_start, (rtl_end_cell + 1) * 30);
     }
 
   x = round ((column + 0.5) * (alloc.width / 7.0));