CoverImage plugin: enable on Remarkable and PocketBook (#6906)

frontend/device/remarkable/device.lua

@@ -95,7 +95,13 @@ function Remarkable:setDateTime(year, month, day, hour, min, sec)
     return os.execute(command) == 0
 end
 
+function Remarkable:_clearScreen()
+    self.screen:clear()
+    self.screen:refreshFull()
+end
+
 function Remarkable:suspend()
+    self:_clearScreen()
     os.execute("systemctl suspend")
 end
 
@@ -103,10 +109,12 @@ function Remarkable:resume()
 end
 
 function Remarkable:powerOff()
+    self:_clearScreen()
     os.execute("systemctl poweroff")
 end
 
 function Remarkable:reboot()
+    self:_clearScreen()
     os.execute("systemctl reboot")
 end
 

plugins/coverimage.koplugin/main.lua

@@ -2,7 +2,7 @@
 
 local Device = require("device")
 
-if not Device.isAndroid() and not Device.isEmulator() then
+if not (Device.isAndroid() or Device.isEmulator() or Device.isRemarkable() or Device.isPocketBook()) then
     return { disabled = true }
 end