Regression in v92: set_child removed

[vanvugt]

It looks like there's a regression in 6745d8c which reverted the fix of 42ee745. set_child should be used in place of add_child to avoid those crashes in GNOME 45.

CC @3v1n0 @sergio-costas

[sergio-costas]

@vanvugt I did that change because the window preview (middle-click in an app with several windows) didn't work. I tried to revert that using set_child, but either it fails (no window thumbnails are shown in the popup), or directly a javascript error is shown in the log because the widget doesn't have set_child(). The only place where using set_child() seems to work is at line 362, where the "close-button-symbolic" icon is placed over each thumbnail.

[vanvugt]

The only place where using set_child() seems to work is at line 362, where the "close-button-symbolic" icon is placed over each thumbnail.

Yes that sounds like what I found when working on the original GNOME 45 bug. Can we check if it's regressed?
https://bugs.launchpad.net/bugs/2056506