Close #14988
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Hitting ENTER in addon manager search field no longer makes tab content disappear

Closes #15162, #14553
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This adds a new function to create a preparsing input thread, and
runs preparsing within a dedicated thread.

std::max is only defined on same T type. Older GCC fail to promote it
correctly.

because we'll need fake chunks

for WMV/VC1

and fix write overflows

should be reusable

Timeline was only supposed for live usage