[FEATURE] maximum size for window

[matthis-k]

Description of the requested feature

The ability to constrain a window/component to a maximum size.

Proposed configuration syntax

simply a field like :maxw

Additional context

Background: I want to remake and improve my statusbar with eww. For that i want a poweroff box, which expands on hover to show options like reboot/poweroff/slepp etc. To stay consitent with my current styling, i want that to be in an 30px x 30px box, but for some reason, i can not get it to fit that, even tho it easily could fit and i hardcoded some widths/heights. Here is an image (top is waybar, bottom eww)

eww.yuck

powermenu_ext false)

(defwindow powermenu 
    :class "shutdown-window"
    :monitor 0
    :geometry (geometry 
        :x "0%"
        :y "0%"
        :width "30px"
        :height "30px"
        :anchor "top right"
    )
    :stacking "overlay"
    :exclusive false
    :focusable false
    (eventbox
        :width "30px"
        :height "30px"
        :hextend true
        :vextend true
        :orientation "center"
        :onhover "eww update powermenu_ext=true"
        :onhoverlost "eww update powermenu_ext=false"
        (box
            :width "30px"
            :height "30px"
            :hextend true
            :vextend true
            :class "shutdown-content"
            :orientation "v"
            :valign "start"
            :space-evenly false
            (label
                :width "30px"
                :height "30px"
                :hextend true
                :vextend true
                :class "shutdown-content"
                :text {powermenu_ext ? "^" : ""}
            )
            (revealer
                :transition "slidedown"
                :duration "500ms"
                :reveal powermenu_ext
                (box
                    :orientation "v"
                    :valign "start"
                    (button
                        :class "shutdown-content"
                        :onclick "systemctl poweroff"
                        ""
                    )
                    (button
                        :class "shutdown-content"
                        :onclick "systemctl reboot"
                        "↺"
                    )
                )
            )
        )
    )
)

eww.scss

@define-color tn0 #1a1b26;
@define-color tn1 #15161E;
@define-color tn2 #414868;
@define-color tn3 #a9b1d6;
@define-color tn4 #c0caf5;
@define-color tn7  #7dcfff;
@define-color tn10 #7aa2f7;
@define-color tn11 #f7768e;
@define-color tn12 #d08770;
@define-color tn13 #e0af68;
@define-color tn14 #9ece6a;
@define-color tn15 #bb9af7;

/* Simple color names */
window {
  background-color: #ffffff;
}

.shutdown-window {
  background-color: transparent;
}

.shutdown-content {
  background-color: #f7768e;
  color: #1a1b26;
  border-radius: 5px;
}