Added default implementations of the new methods where necessary. Before we go around implementing them, it's time for a massive rewrite of uiBox.

darwin/box.m

@@ -107,6 +107,8 @@ static void uiBoxSyncEnableState(uiDarwinControl *c, int enabled)
 }
 
 uiDarwinControlDefaultSetSuperview(uiBox, view)
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtTrailingEdge(uiBox, view)
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtBottom(uiBox, view)
 
 static int isStretchy(uiBox *b, uintmax_t n)
 {

darwin/group.m

@@ -69,6 +69,8 @@ static void uiGroupSyncEnableState(uiDarwinControl *c, int enabled)
 }
 
 uiDarwinControlDefaultSetSuperview(uiGroup, box)
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtTrailingEdge(uiGroup, box)
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtBottom(uiGroup, box)
 
 static void groupRelayout(uiGroup *g)
 {

darwin/tab.m

@@ -55,6 +55,8 @@ uiDarwinControlDefaultDisable(uiTab, tabview)
 uiDarwinControlDefaultSyncEnableState(uiTab, tabview)
 
 uiDarwinControlDefaultSetSuperview(uiTab, tabview)
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtTrailingEdge(uiTab, tabview)
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtBottom(uiTab, tabview)
 
 static void tabRelayout(uiTab *t)
 {

darwin/window.m

@@ -141,6 +141,9 @@ static void uiWindowSetSuperview(uiDarwinControl *c, NSView *superview)
 	// TODO
 }
 
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtTrailingEdge(uiWindow, window)
+uiDarwinControlDefaultChildrenShouldAllowSpaceAtBottom(uiWindow, window)
+
 static void windowRelayout(uiWindow *w)
 {
 	uiDarwinControl *cc;