fix: harden classroom presentations

config/plasma/xdg/kwinrc

@@ -82,15 +82,14 @@ NoiseStrength=2
 [org.kde.kdecoration2][$i]
 library=org.kde.breeze
 theme=Breeze
-# A pin and a close button, and nothing else.
-#
-# The pin is the Live View story: keeping a window above the others is a
-# window-manager state, not a feature the classroom has to invent. There is
-# deliberately no minimise button, because a minimised window is the one
-# thing a teacher cannot see the state of — measured, not assumed. Double
-# clicking the title bar still maximises, so nothing is unreachable.
+# A close button, and nothing else. `F` was the keep-above button, rendered
+# by Breeze as an unexplained double chevron beside Close. Classroom windows
+# that must stay above others request that state themselves; teachers do not
+# need a title-bar toggle for it. There is deliberately no minimise button,
+# because a minimised window is the one thing a teacher cannot see the state
+# of. Double clicking the title bar still maximises ordinary windows.
 ButtonsOnLeft=
-ButtonsOnRight=FX
+ButtonsOnRight=X
 ShowToolTips=false
 BorderSize=None
 BorderSizeAuto=false

config/plasma/xdg/kwinrulesrc

@@ -1,6 +1,6 @@
 # Window rules.
 #
-# There are two: one about video, one about the Parent Call card.
+# There are three: video, the Parent Call card, and the presentation surface.
 #
 # Everything else the classroom used to arrange by hand is ordinary window
 # manager behaviour and needs no rule: a dialog stays in front of the window
@@ -17,8 +17,8 @@
 # 314-line window arbiter was doing.
 
 [General]
-count=2
-rules=classroom-video,classroom-parent-call
+count=3
+rules=classroom-video,classroom-parent-call,classroom-presentation
 
 [classroom-video]
 Description=Video is an appliance screen, not a window
@@ -48,3 +48,20 @@ skippagerrule=2
 # button, rather than behind it.
 above=true
 aboverule=2
+
+[classroom-presentation]
+Description=A presentation is the whole display, not a large window
+# The library and Quick Look have the same Wayland app id, so the stable
+# presenter title is part of this match. Matching the app alone would make
+# every Presentations window fullscreen.
+wmclass=ekklesia-presentations
+wmclassmatch=1
+wmclasscomplete=false
+title=Presenting
+titlematch=1
+fullscreen=true
+fullscreenrule=2
+noborder=true
+noborderrule=2
+skiptaskbar=true
+skiptaskbarrule=2