Add opacity-rule option for picom

Use this option to specify that anything containing “(Meeting) | Microsoft
Teams” (which should be in the title of MS Teams when in a meeting) should have
100% opacity, and also that anything containing “freerdp” should have 100%
opacity.

For Teams I really only need it to be opaque once a meeting starts, I don't care
the rest of the time.

For XFreeRDP I've tried matching on ‘class_g’, ‘name’, nothing seems to work.
Using ‘opacity-rule’ finally seems to have an effect.

The rules both use ‘*’ to match anywhere in the name, and ‘?’ to specify that
the match should be case-insensitive.

oni/home/config/rincewind.scm

@@ -117,7 +117,6 @@
              '("name = 'mowedline'"
                "class_g = 'trayer'"
                "bounding_shaped"
-               "class_g = 'xfreerdp'"
                "class_g = 'i3lock'"))
             (wintypes
              '((dnd (shadow . #f))
@@ -127,6 +126,9 @@
             (active-opacity 95)
             (frame-opacity 100)
             (inactive-opacity-override #t)
+            (opacity-rule
+             '("100:name *?= '(Meeting) | Microsoft Teams'"
+               "100:name *?= 'freerdp'"))
             (blur-background #t)
             (blur-background-frame #t)
             (blur
@@ -135,16 +137,13 @@
             (blur-background-fixed #t)
             (blur-background-exclude
              '("name *= 'rofi'"
-               "class_g = 'xfreerdp'"
                "class_g = 'i3lock'"))
             (focus-exclude
              '("name *= 'rofi'"
-               "class_g = 'xfreerdp'"
                "class_g = 'i3lock'"))
             (fading #t)
             (fade-exclude
-             `("class_g = 'xfreerdp'"
-               "class_g = 'i3lock'"))
+             `("class_g = 'i3lock'"))
             (fade-in-step 3)
             (fade-out-step 3))))
 

oni/home/services/picom.scm

@@ -143,6 +143,9 @@
   (blur-background-exclude
    (list '())
    "Exclude conditions for background blur")
+  (opacity-rule
+   (list '())
+   "Specify a list of opacity rules, in the format PERCENT:PATTERN, like 50:name *= \"Firefox\".")
   (focus-exclude
    (list '())
    "Specify a list of conditions of windows that should always be considered focused")