queue2: fix merging of ranges
queue2: fix merging of ranges

When we merge two ranges, don't updata the current range writing_pos with
whereever we were writing earlier in the merged range.  Spotted by bilboed.

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