Fix issue of add/remove a frame at a scene before all key frames of a layer. When you added or removed a frame at a scene before all key frames of a layer, frameline was not updated correctly. It seems nothing happened, but domview is updated. This changeset fix this issue by correcting logic for boundary case.

INCLUDES = -I$(top_srcdir)/include

if SH_TEXT
APPCFLAGS = @pangocairo_CFLAGS@
APPLDFLAGS = @pangocairo_LIBS@
else
APPCFLAGS = @cairo_CFLAGS@
APPLDFLAGS = @cairo_LIBS@
endif