basesrc: fix gst_base_src_new_seamless_segment()
basesrc: fix gst_base_src_new_seamless_segment()

Keep track of pending newsegment in gst_base_src_new_seamless_segment()
to avoid pushing newsegment update before newsegment.

lubosz/gstreamer,krichter722/gstreamer,drothlis/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,mparis/gstreamer,drothlis/gstreamer,collects/gstreamer,ylatuya/gstreamer,lubosz/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,drothlis/gstreamer,collects/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,centricular/gstreamer,cfoch/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,krichter722/gstreamer,cfoch/gstreamer,ensonic/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,lovebug356/gstreamer,cablelabs/gstreamer,jpakkane/gstreamer,collects/gstreamer,shelsonjava/gstreamer,drothlis/gstreamer,collects/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,Distrotech/gstreamer,cfoch/gstreamer,magcius/gstreamer,surround-io/gstreamer,centricular/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,ahmedammar/platform_external_gst_gstreamer,mparis/gstreamer,jpakkane/gstreamer,Distrotech/gstreamer,mrchapp/gstreamer,Distrotech/gstreamer,lovebug356/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,magcius/gstreamer,lubosz/gstreamer,magcius/gstreamer,mparis/gstreamer,magcius/gstreamer,ylatuya/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,jpakkane/gstreamer,ylatuya/gstreamer,cablelabs/gstreamer,centricular/gstreamer,collects/gstreamer,magcius/gstreamer,justinjoy/gstreamer,Distrotech/gstreamer,ahmedammar/platform_external_gst_gstreamer,surround-io/gstreamer,Lachann/gstreamer,drothlis/gstreamer,ahmedammar/platform_external_gst_gstreamer,cablelabs/gstreamer,Lachann/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,ylatuya/gstreamer,ahmedammar/platform_external_gst_gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,mrchapp/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,ylatuya/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,Distrotech/gstreamer,justinjoy/gstreamer,centricular/gstreamer,krieger-od/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,centricular/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,krichter722/gstreamer,cfoch/gstreamer