Bug 316964 – [MSE][GStreamer] imported/w3c/web-platform-tests/media-source/mediasource-remove.html is a permanent failure

• Status: NEW
• Component: Media

[Jean-Yves Avenard [:jya]]

```
--- /sdk/webkit/layout-test-results/imported/w3c/web-platform-tests/media-source/mediasource-remove-expected.txt
+++ /sdk/webkit/layout-test-results/imported/w3c/web-platform-tests/media-source/mediasource-remove-actual.txt
@@ -11,8 +11,8 @@
 PASS Test aborting a remove operation.
 PASS Test remove with a start at the duration.
 PASS Test remove transitioning readyState from 'ended' to 'open'.
-PASS Test removing all appended data.
-PASS Test removing beginning of appended data.
-PASS Test removing the middle of appended data.
-PASS Test removing the end of appended data.
+FAIL Test removing all appended data. assert_equals: Initial buffered range. expected "{ [0.095, 6.548) }" but got "{ [0.000, 6.548) }"
+FAIL Test removing beginning of appended data. assert_equals: Initial buffered range. expected "{ [0.095, 6.548) }" but got "{ [0.000, 6.548) }"
+FAIL Test removing the middle of appended data. assert_equals: Initial buffered range. expected "{ [0.095, 6.548) }" but got "{ [0.000, 6.548) }"
+FAIL Test removing the end of appended data. assert_equals: Initial buffered range. expected "{ [0.095, 6.548) }" but got "{ [0.000, 6.548) }"
 ```

https://ews-build.s3-us-west-2.amazonaws.com/GTK-WK2-Tests-EWS/b969c9c9-139006/results.html

The failure is almost certainly due to the empty edit list designed to shift video by 0.095 being ignored, which is surprising because ffmpeg handles those properly (same underlying reason as bug 316870)

[Jean-Yves Avenard [:jya]]

Fixing those offsets would almost certainly fix bug 167108 for imported/w3c/web-platform-tests/media-source/mediasource-sequencemode-append-buffer.html