window layouter: control maximize by editing rules

This patch adds the missing propagation of the maximized state from the
layout rules to the internal representation of a window. Without this
patch this state could be toggled by clicking on the maximizer button
only.

repos/gems/src/app/window_layouter/assign.h

@@ -115,6 +115,8 @@ class Window_layouter::Assign : public List_model<Assign>::Element
 			return Rect(outer.p1() + target_geometry.p1(), outer.area());
 		}
 
+		bool maximized() const { return _maximized; }
+
 		/**
 		 * Call 'fn' with 'Registry<Member>' if label matches assignment
 		 *

repos/gems/src/app/window_layouter/main.cc

@@ -116,6 +116,7 @@ struct Window_layouter::Main : Operations,
 					                                         target.geometry(),
 					                                         _decorator_margins);
 					member.window.outer_geometry(rect);
+					member.window.maximized(assign.maximized());
 				});
 			});
 		});