event-widget: Properly overflow

This explicitely allows the hour widget and the content as a whole to
overflow horizontally, and hides what overflows, keeping the data within
the boundaries of the widget while still allowing it to reach very
narrow sizes without error messages.

This purposefully leaves the indentation broken to help reviewing the
actual changes.

src/gui/gcal-event-widget.c

@@ -28,6 +28,7 @@
 #include "gcal-debug.h"
 #include "gcal-event-popover.h"
 #include "gcal-event-widget.h"
+#include "gcal-overflow-bin.h"
 #include "gcal-utils.h"
 
 #define DESC_MAX_CHAR 200
@@ -759,6 +760,8 @@ gcal_event_widget_init (GcalEventWidget *self)
   widget = GTK_WIDGET (self);
   self->clock_format_24h = is_clock_format_24h ();
 
+  g_type_ensure (GCAL_TYPE_OVERFLOW_BIN);
+
   gtk_widget_init_template (widget);
 
   gtk_widget_set_cursor_from_name (GTK_WIDGET (self), "pointer");