userscripts: run view_in_mpv jseval in main world

1. run jseval in main world: the script adds an element that calls the
   `restore_video` function. This was failing with a "not found" message
   on webengine, presumably because the dom click handler runs in the
   main world and the function was over in the jseval world. The the
   script predates webengine which is the backend that implements the
   worlds.
2. remove a console log message, seems to be just noise and easy enough
   to add back later
3. remove href attribute of the restore video link: this seemed to be
   causing the `restore_video` method to be called twice. The second
   time with `this` as the global Window object, which was causing an
   error because that has a null `parentNode` attribute.
4. added the `cursor: pointer` style that was needed since the element
   didn't have an href anymore
5. change the mpv flags `--terminal` -> `--quiet`. This means we get
   error messages (eg from yt-dlp) in error logs and in the `:process`
   page now. It can get a bit spammy though if you are running from a
   terminal. I'm getting a log of keepalive warning and error logs from
   ffmpeg. On the other hand it's really annoying to see a "process
   failed, see :process for details" and having no error messages in
   there.

Fixes: #7838
(cherry picked from commit d4a7619f9c)

doc/changelog.asciidoc

@@ -15,6 +15,16 @@ breaking changes (such as renamed commands) can happen in minor releases.
 // `Fixed` for any bug fixes.
 // `Security` to invite users to upgrade in case of vulnerabilities.
 
+[[v3.0.1]]
+v3.0.1 (unreleased)
+-------------------
+
+Fixed
+~~~~~
+
+- The "restore video" functionality of the `view_in_mpv` script works again on
+  webengine.
+
 [[v3.0.0]]
 v3.0.0 (2023-08-18)
 -------------------

misc/userscripts/view_in_mpv

@@ -49,7 +49,7 @@ msg() {
 
 MPV_COMMAND=${MPV_COMMAND:-mpv}
 # Warning: spaces in single flags are not supported
-MPV_FLAGS=${MPV_FLAGS:- --force-window --no-terminal --keep-open=yes --ytdl}
+MPV_FLAGS=${MPV_FLAGS:- --force-window --quiet --keep-open=yes --ytdl}
 IFS=" " read -r -a video_command <<< "$MPV_COMMAND $MPV_FLAGS"
 
 js() {
@@ -94,9 +94,9 @@ cat <<EOF
             <a style=\\"font-weight: bold;
                         color: white;
                         background: transparent;
+                        cursor: pointer;
                      \\"
                onClick=\\"restore_video(this, " + i + ");\\"
-               href=\\"javascript: restore_video(this, " + i + ")\\"
               >click here</a>.
             </p>
         ";
@@ -119,7 +119,6 @@ cat <<EOF
     function restore_video(obj, index) {
         obj = App.all_replacements[index];
         video = App.backup_videos[index];
-        console.log(video);
         obj.parentNode.replaceChild(video, obj);
     }
 
@@ -137,7 +136,7 @@ EOF
 printjs() {
     js | sed 's,//.*$,,' | tr '\n' ' '
 }
-echo "jseval -q $(printjs)" >> "$QUTE_FIFO"
+echo "jseval -q -w main $(printjs)" >> "$QUTE_FIFO"
 
 msg info "Opening $QUTE_URL with mpv"
 "${video_command[@]}" "$@" "$QUTE_URL"