AUI panels now take up the entire window

Use a nasty hack to workaround AUI's inability to take into account BestSize()
when initially adding a docked pane. The panes are all added with a minimum
size of approximately half the window, then those minimum sizes are reset to a
much smaller value after the first Update(). This results in panels which take
up the entire window to begin with, but can still be shrunk by the user if
required.

radiant/ui/mainframe/AuiLayout.cpp

@@ -23,11 +23,15 @@ namespace
 {
     const std::string RKEY_ROOT = "user/ui/mainFrame/aui";
 
+    // Minimum size of docked panels
+    const wxSize MIN_SIZE(128, 128);
+
     // Return a pane info with default options
-    wxAuiPaneInfo DEFAULT_PANE_INFO(const std::string& caption)
+    wxAuiPaneInfo DEFAULT_PANE_INFO(const std::string& caption,
+                                    const wxSize& minSize)
     {
         return wxAuiPaneInfo().Caption(caption).Layer(1).CloseButton(false)
-                              .MinSize(wxSize(128, 128));
+                              .MinSize(minSize);
     }
 }
 
@@ -37,6 +41,12 @@ AuiLayout::AuiLayout()
 {
 }
 
+void AuiLayout::addPane(wxWindow* window, const wxAuiPaneInfo& info)
+{
+    _auiMgr.AddPane(window, info);
+    _panes.push_back(window);
+}
+
 std::string AuiLayout::getName()
 {
     return AUI_LAYOUT_NAME;
@@ -85,12 +95,23 @@ void AuiLayout::activate()
 
     // Add the camera and notebook to the left, as with the Embedded layout, and
     // the 2D view on the right
-    _auiMgr.AddPane(_camWnd->getMainWidget(),
-                    DEFAULT_PANE_INFO(_("Camera")).Left().Position(0));
-    _auiMgr.AddPane(notebookPanel,
-                    DEFAULT_PANE_INFO(_("Properties")).Left().Position(1));
-    _auiMgr.AddPane(xywnd->getGLWidget(),
-                    DEFAULT_PANE_INFO(_("2D View")).Right());
+    wxSize size = topLevelParent->GetSize();
+    size.Scale(0.5, 1.0);
+    addPane(xywnd->getGLWidget(),
+            DEFAULT_PANE_INFO(_("2D View"), size).Right());
+    addPane(_camWnd->getMainWidget(),
+            DEFAULT_PANE_INFO(_("Camera"), size).Left().Position(0));
+    addPane(notebookPanel,
+            DEFAULT_PANE_INFO(_("Properties"), size).Left().Position(1));
+    _auiMgr.Update();
+
+    // Nasty hack to get the panes sized properly. Since BestSize() is
+    // completely ignored (at least on Linux), we have to add the panes with a
+    // large *minimum* size and then reset this size after the initial addition.
+    for (wxWindow* w: _panes)
+    {
+        _auiMgr.GetPane(w).MinSize(MIN_SIZE);
+    }
     _auiMgr.Update();
 
     // Hide the camera toggle option for non-floating views

radiant/ui/mainframe/AuiLayout.h

@@ -26,9 +26,16 @@ class AuiLayout: public IMainFrameLayout
     // Main AUI manager
     wxAuiManager _auiMgr;
 
+    // List of panes managed by the AUI manager
+    using Panes = std::list<wxWindow*>;
+    Panes _panes;
+
     // Main constructor
     AuiLayout();
 
+    // Add a pane to the wxAuiManager and store it in the list
+    void addPane(wxWindow* window, const wxAuiPaneInfo& info);
+
 public:
 	// IMainFrameLayout implementation
 	std::string getName() override;