[evolution] Fix invalid cast in e_calendar_item_get_date_for_cell()

[Milan Crha <mcrha src gnome org>]

commit 752106a632820c3009ff3c756fd491fc93135242
Author: Milan Crha <mcrha redhat com>
Date:   Mon Feb 8 19:43:56 2021 +0100

    Fix invalid cast in e_calendar_item_get_date_for_cell()
    
    There's no need to use the Atk function implementation, the more it uses
    an AtkObject, which is harder to get to, thus rather calculate the index
    directly.

 src/e-util/ea-calendar-cell.c | 13 ++++++-------
 src/e-util/ea-calendar-item.c |  7 ++++++-
 2 files changed, 12 insertions(+), 8 deletions(-)
---
diff --git a/src/e-util/ea-calendar-cell.c b/src/e-util/ea-calendar-cell.c
index d527ff21a1..1813b79642 100644
--- a/src/e-util/ea-calendar-cell.c
+++ b/src/e-util/ea-calendar-cell.c
@@ -235,11 +235,10 @@ ea_calendar_cell_get_name (AtkObject *accessible)
                gchar buffer[128];
 
                cell = E_CALENDAR_CELL (g_obj);
-               e_calendar_item_get_date_for_cell (cell->calitem, cell->row,
-                                                    cell->column,
-                                                    &year, &month, &day);
-
-               g_snprintf (buffer, 128, "%d-%d-%d", year, month + 1, day);
+               if (e_calendar_item_get_date_for_cell (cell->calitem, cell->row, cell->column, &year, &month, 
&day))
+                       g_snprintf (buffer, 128, "%d-%d-%d", year, month + 1, day);
+               else
+                       buffer[0] = '\0';
                ATK_OBJECT_CLASS (parent_class)->set_name (accessible, buffer);
        }
        return accessible->name;
@@ -342,8 +341,8 @@ component_interface_get_extents (AtkComponent *component,
        calitem = cell->calitem;
        atk_obj = atk_gobject_accessible_for_object (G_OBJECT (calitem));
        ea_calitem = EA_CALENDAR_ITEM (atk_obj);
-       e_calendar_item_get_date_for_cell (calitem, cell->row, cell->column,
-                                            &year, &month, &day);
+       if (!e_calendar_item_get_date_for_cell (calitem, cell->row, cell->column, &year, &month, &day))
+               return;
 
        if (!e_calendar_item_get_day_extents (calitem,
                                              year, month, day,
diff --git a/src/e-util/ea-calendar-item.c b/src/e-util/ea-calendar-item.c
index c22adfbef5..1af1ac62e4 100644
--- a/src/e-util/ea-calendar-item.c
+++ b/src/e-util/ea-calendar-item.c
@@ -1269,6 +1269,9 @@ e_calendar_item_get_date_for_offset (ECalendarItem *calitem,
 
        g_return_val_if_fail (E_IS_CALENDAR_ITEM (calitem), FALSE);
 
+       if (day_offset < 0)
+               return FALSE;
+
        if (!e_calendar_item_get_date_range (calitem, &start_year,
                                             &start_month, &start_day,
                                             &end_year, &end_month,
@@ -1294,7 +1297,9 @@ e_calendar_item_get_date_for_cell (ECalendarItem *calitem,
                                      gint *month,
                                      gint *day)
 {
-       gint index = table_interface_get_index_at (ATK_TABLE (calitem), row, column);
+       gint index;
+
+       index = row * EA_CALENDAR_COLUMN_NUM + column;
 
        return e_calendar_item_get_date_for_offset (calitem, index, year, month, day);
 }