#2351 don't enable idle mixin for clients without keyboard, mouse or …

…windows shown

git-svn-id: https://xpra.org/svn/Xpra/trunk@25163 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/server/source/idle_mixin.py

@@ -16,6 +16,12 @@
 
 class IdleMixin(StubSourceMixin):
 
+    @classmethod
+    def is_needed(cls, caps : typedict) -> bool:
+        #the 'keyboard' and 'mouse' capability were only added in v4,
+        #so we have to enable the mixin by default:
+        return caps.boolget("keyboard", True) or caps.boolget("mouse", True) or caps.boolget("windows", False)
+
     def __init__(self):
         self.idle_timeout = 0