Dash menu: STILL get the issue of opening the menu every once in a while and hovering any entry (shutdown options, favs, programs) first icon does not highlight and therefore cant be clicked.

[star-buck]

No description provided.

[star-buck]

the menu on latest manajro is still laggy, even after hovering for a while over the categories, it takes another 1-2 seconds before any icon the mouse cursor is on appears to be hovered and selected....

[davidedmundson]

I did some profiling. It's spending way too much time loading icons for the main grid. This doesn't affect kickoff as much as there are fewer icons visible at a single time.
The slowdown is for a number of reasons, so this won't be fixed in a single commit. I will split out some of obvious waste spotted so far:

• We're creating a new Plasma::Theme object each icon paint to get the palette (https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/349)

• Icon delegates are not recylced

• The "enabled" property gets propagated to the icons triggering both a redraw and a slow path painting effects
  The "all apps grid" and "mainGrid" both exist at once and toggle enabled and visibility.
  https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/598

• The logic in onPositionChanged (DashboardRepresentation.qml:885) looks very weird. Sometimes we do things immediately, sometimes after a 50ms timeout. The immediate call gets triggered too often, and the compressed path (with the timeout) is waaay too long.

I will make commits for them, and then we'll see where things stand.