videoaggregator: keep old buffer when processing a MISSING_DATA gap

GAP events flagged with MISSING_DATA are transformed into GAP buffers
flagged with CORRUPTED.

In these cases, it is preferable to simply keep rendering the previous
buffer (if there was one) instead of flashing the pad in and out of
view.
34 jobs for !944 with agg-forward-gap-info in 41 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Build Docker
passed #5826236
alpine amd64 manifest builder docker

00:00:30

passed #5826235
android docker

00:00:31

passed #5826234
cerbero fedora amd64 docker

00:00:31

passed #5826233
fedora amd64 docker

00:00:29

passed #5826237
gst-indent amd64 docker

00:00:22

 
  Preparation
passed #5826239
gst indent

00:00:09

manual #5826238
manual
manifest
 
  Build
created #5826248
gstreamer
build cerbero cross-android universal
created #5826252
gst-ios-13.2
build cerbero cross-ios universal
created #5826249
gstreamer
build cerbero cross win32
created #5826250
gstreamer
build cerbero cross win64
created #5826247
gstreamer
build cerbero fedora x86_64
created #5826251
gst-macos-10.15
build cerbero macos x86_64
created #5826253
1809 gstreamer-windows windows docker
build cerbero msvc x86_64
created #5826243
build clang fedora x86_64
created #5826246
1809 windows docker allowed to fail manual
build msys2
created #5826240
build nodebug fedora x86_64
created #5826241
build static fedora x86_64
created #5826242
build static nodebug fedora x86_64
created #5826244
1809 windows docker
build vs2017 amd64
created #5826245
1809 windows docker
build vs2017 x86
 
  Test
created #5826254
gstreamer
check fedora
created #5826255
gstreamer
integration testsuites fedora 1/4
created #5826256
gstreamer
integration testsuites fedora 2/4
created #5826257
gstreamer
integration testsuites fedora 3/4
created #5826258
gstreamer
integration testsuites fedora 4/4
created #5826262
gstreamer
valgrind bad
created #5826259
gstreamer
valgrind base
created #5826263
gstreamer
valgrind ges
created #5826260
gstreamer
valgrind good
created #5826261
gstreamer
valgrind ugly
 
  Integrate
created #5826264
cross-android universal examples
created #5826266
gst-ios-13.2
cross-ios universal examples
created #5826265
documentation