Create a SetMaxItemWidth() method and set it in horizontal mode on update

src/apps/deskbar/BarView.cpp

@@ -509,6 +509,11 @@ TBarView::PlaceApplicationBar()
 	fExpandoMenuBar->MoveTo(0, 0);
 	fExpandoMenuBar->ResizeTo(expandoFrame.Width(), expandoFrame.Height());
 
+	if (!fVertical) {
+		// Set the max item width based on icon size
+		fExpandoMenuBar->SetMaxItemWidth();
+	}
+
 	fExpandoMenuBar->BuildItems();
 	if (fVertical)
 		ExpandItems();

src/apps/deskbar/ExpandoMenuBar.cpp

@@ -94,15 +94,7 @@ TExpandoMenuBar::TExpandoMenuBar(BRect frame, const char* name,
 {
 	SetItemMargins(0.0f, 0.0f, 0.0f, 0.0f);
 	SetFont(be_plain_font);
-	if (fVertical)
-		SetMaxContentWidth(sMinimumWindowWidth);
-	else {
-		// Make more room for the icon in horizontal mode
-		int32 iconSize = static_cast<TBarApp*>(be_app)->IconSize();
-		float maxContentWidth = sMinimumWindowWidth + iconSize
-			- kMinimumIconSize;
-		SetMaxContentWidth(maxContentWidth);
-	}
+	SetMaxItemWidth();
 
 	// top or bottom mode, add deskbar menu and sep for menubar tracking
 	// consistency
@@ -913,6 +905,20 @@ TExpandoMenuBar::CheckForSizeOverrun()
 }
 
 
+void
+TExpandoMenuBar::SetMaxItemWidth()
+{
+	if (fVertical)
+		SetMaxContentWidth(sMinimumWindowWidth);
+	else {
+		// Make more room for the icon in horizontal mode
+		int32 iconSize = static_cast<TBarApp*>(be_app)->IconSize();
+		SetMaxContentWidth(sMinimumWindowWidth + iconSize
+			- kMinimumIconSize);
+	}
+}
+
+
 void
 TExpandoMenuBar::SizeWindow(int32 delta)
 {

src/apps/deskbar/ExpandoMenuBar.h

@@ -87,6 +87,8 @@ public:
 
 			menu_layout		MenuLayout() const;
 
+			void			SetMaxItemWidth();
+
 			void			SizeWindow(int32 delta);
 			bool			CheckForSizeOverrun();