replace FbRootWindow::depth with maxDepth

The depth member of FbWindow was abused to store the maximum depth
but that gets overridden with geometry changes of the root window
(screen layout changes) so we store and read the value explicitly while
::depth() maintains the actual depth of the root window

The result of this is that frames for ARGB windows were created with a
wrong depth and failed to reparent the client window.

BUG: 1102
BUG: 1058

src/FbRootWindow.cc

@@ -30,7 +30,8 @@ FbRootWindow::FbRootWindow(int screen_num):
     m_colormap(0),
     m_decorationDepth(0),
     m_decorationVisual(0),
-    m_decorationColormap(0) {
+    m_decorationColormap(0),
+    m_maxDepth(depth()) {
 
     Display *disp = FbTk::App::instance()->display();
 
@@ -55,9 +56,9 @@ FbRootWindow::FbRootWindow(int screen_num):
 
         for (int i = 0; i < vinfo_nitems; i++) {
             if ((DefaultDepth(disp, screen_num) < vinfo_return[i].depth)
-                    && (static_cast<int>(depth()) < vinfo_return[i].depth)){
+                    && (m_maxDepth < vinfo_return[i].depth)){
                 m_visual = vinfo_return[i].visual;
-                setDepth(vinfo_return[i].depth);
+                m_maxDepth = vinfo_return[i].depth;
             }
 
             if((m_decorationDepth < vinfo_return[i].depth)

src/FbRootWindow.hh

@@ -41,6 +41,7 @@ public:
     int decorationDepth() const { return m_decorationDepth; }
     Visual *decorationVisual() const { return m_decorationVisual; }
     Colormap decorationColormap() const { return m_decorationColormap; }
+    int maxDepth() const { return m_maxDepth; }
 
 private:
     Visual *m_visual;
@@ -49,6 +50,7 @@ private:
     int m_decorationDepth;
     Visual *m_decorationVisual;
     Colormap m_decorationColormap;
+    int m_maxDepth;
 };
 
 #endif // FBROOTWINDOW_HH

src/FbWinFrame.cc

@@ -115,8 +115,8 @@ FbWinFrame::FbWinFrame(BScreen &screen, unsigned int client_depth,
     m_state(state),
     m_window(theme->screenNum(), state.x, state.y, state.width, state.height, s_mask, true, false,
         client_depth, InputOutput,
-        ((client_depth == 32) && (screen.rootWindow().depth() == 32) ? screen.rootWindow().visual() : CopyFromParent),
-        ((client_depth == 32) && (screen.rootWindow().depth() == 32) ? screen.rootWindow().colormap() : CopyFromParent)),
+        (client_depth == screen.rootWindow().maxDepth() ? screen.rootWindow().visual() : CopyFromParent),
+        (client_depth == screen.rootWindow().maxDepth() ? screen.rootWindow().colormap() : CopyFromParent)),
     m_layeritem(window(), *screen.layerManager().getLayer(ResourceLayer::NORMAL)),
     m_titlebar(m_window, 0, 0, 100, 16, s_mask, false, false, 
         screen.rootWindow().decorationDepth(), InputOutput,

src/Screen.cc

@@ -297,7 +297,7 @@ BScreen::BScreen(FbTk::ResourceManager &rm,
                             "using visual 0x%lx, depth %d\n",
                             "informational message saying screen number (%d), visual (%lx), and colour depth (%d)").c_str(),
             screenNumber(), XVisualIDFromVisual(rootWindow().visual()),
-            rootWindow().depth());
+            rootWindow().maxDepth());
 #endif // DEBUG
 
     FbTk::EventManager *evm = FbTk::EventManager::instance();