bug(firefox): "Double" windows decorations

[tomsquest]

Hi,

Firefox has a problem of "double decoration" when I resize it to the right/left.

This happens only on the first Firefox window (not an additional one).

In this screenshot, you can see that a padding has been applied to the Firefox window, around it:

To reproduce, I just have to full-screen a Firefox window, then apply the Quick Tile Window to the Left (or Right) shortcut to resize the window.

Details

• Firefox 88
• KUbuntu 20.04.2 LTS

Xprop:

$ xprop | grep WM_
_KDE_NET_WM_FRAME_STRUT(CARDINAL) = 0, 0, 29, 0
_NET_WM_OPAQUE_REGION(CARDINAL) = 28, 16, 1224, 10, 18, 26, 1244, 1365
_NET_WM_ICON_GEOMETRY(CARDINAL) = 1332, 1404, 262, 34
_KDE_NET_WM_ACTIVITIES(STRING) = "00000000-0000-0000-0000-000000000000"
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_MOVE, _NET_WM_ACTION_RESIZE, _NET_WM_ACTION_MINIMIZE, _NET_WM_ACTION_SHADE, _NET_WM_ACTION_MAXIMIZE_VERT, _NET_WM_ACTION_MAXIMIZE_HORZ, _NET_WM_ACTION_FULLSCREEN, _NET_WM_ACTION_CHANGE_DESKTOP, _NET_WM_ACTION_CLOSE
_NET_WM_DESKTOP(CARDINAL) = 0
WM_STATE(WM_STATE):
_NET_WM_STATE(ATOM) = 
WM_HINTS(WM_HINTS):
WM_WINDOW_ROLE(STRING) = "browser"
_NET_WM_BYPASS_COMPOSITOR(CARDINAL) = 2
_NET_WM_ICON(CARDINAL) = 	Icon (16 x 16):
_MOTIF_WM_HINTS(_MOTIF_WM_HINTS) = 0x2, 0x0, 0x0, 0x0, 0x0
_KDE_NET_WM_USER_CREATION_TIME(CARDINAL) = 1817030
_NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_NORMAL
_NET_WM_SYNC_REQUEST_COUNTER(CARDINAL) = 60818934, 60818935
_NET_WM_USER_TIME(CARDINAL) = 5520107
_NET_WM_USER_TIME_WINDOW(WINDOW): window id # 0x3a005f5
WM_CLIENT_LEADER(WINDOW): window id # 0x3a00001
_NET_WM_PID(CARDINAL) = 2686
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
WM_CLIENT_MACHINE(STRING) = "desktop"
WM_NORMAL_HINTS(WM_SIZE_HINTS):
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING, _NET_WM_SYNC_REQUEST
WM_CLASS(STRING) = "Navigator", "Firefox"
WM_ICON_NAME(COMPOUND_TEXT) = "New Issue · bahamondev/hide-titles — Mozilla Firefox"
_NET_WM_ICON_NAME(UTF8_STRING) = "New Issue · bahamondev/hide-titles — Mozilla Firefox"
WM_NAME(COMPOUND_TEXT) = "New Issue · bahamondev/hide-titles — Mozilla Firefox"
_NET_WM_NAME(UTF8_STRING) = "New Issue · bahamondev/hide-titles — Mozilla Firefox"