No need to push/pop a group. Slightly improves performance when
filling the whole screen with one of the fill pattern.

https://gitlab.gnome.org/GNOME/vte/-/issues/2799
(cherry picked from commit 9e505743)

Unfortunately doesn't make too much of a different to NEAREST, but every
bit helps.

https://gitlab.gnome.org/GNOME/vte/-/issues/2799
(cherry picked from commit dddf82c7)

Fixes a regression from commit bbafeae5.

Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2803
(cherry picked from commit da681614)

... allowing it to carry the exit status.

Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2805

This allows this function to work as a
"vte_terminal_get_termprop_has_value()" API.

Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2807

Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2811
(cherry picked from commit 78e1ac8e)

(cherry picked from commit ba0b3109)

Commit f44e1c20 accidentally made OSC 7
emit the legacy OSC 6 notification.

Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2806
(cherry picked from commit 9e703435)

(cherry picked from commit 7fbf500f)

Use a raw string for the regex.

Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2814
(cherry picked from commit 50fefcc7)

This hasn't matured yet and may be the cause of some issues, so revert
this for stable for now.

This reverts commit e4c9a985.
This reverts commit fb6e734a.
This reverts commit 2dfc0f7f.