Fix an OpenGL initialization glitch.

Before this commit, the first time NewFrame() is called,
the background color would not be filled, leading to interference
with whatever the GUI toolkit decided to put there.

src/draw.cpp

@@ -829,9 +829,9 @@ void GraphicsWindow::Paint() {
 
     auto renderStartTime = std::chrono::high_resolution_clock::now();
 
-    canvas->NewFrame();
-    canvas->SetCamera(camera);
     canvas->SetLighting(lighting);
+    canvas->SetCamera(camera);
+    canvas->NewFrame();
     Draw(canvas.get());
     canvas->FlushFrame();
 

src/render/rendergl2.cpp

@@ -433,6 +433,7 @@ void OpenGl2Renderer::Init() {
     glGenVertexArrays(1, &array);
     glBindVertexArray(array);
 #endif
+    UpdateProjection();
 }
 
 void OpenGl2Renderer::DrawLine(const Vector &a, const Vector &b, hStroke hcs) {
@@ -675,7 +676,9 @@ void OpenGl2Renderer::GetIdent(const char **vendor, const char **renderer, const
 
 void OpenGl2Renderer::SetCamera(const Camera &c) {
     camera = c;
-    UpdateProjection();
+    if(initialized) {
+        UpdateProjection();
+    }
 }
 
 void OpenGl2Renderer::SetLighting(const Lighting &l) {

src/textwin.cpp

@@ -870,9 +870,9 @@ void TextWindow::Paint() {
     Lighting lighting = {};
     lighting.backgroundColor = RGBi(0, 0, 0);
 
-    canvas->NewFrame();
-    canvas->SetCamera(camera);
     canvas->SetLighting(lighting);
+    canvas->SetCamera(camera);
+    canvas->NewFrame();
 
     UiCanvas uiCanvas = {};
     uiCanvas.canvas = canvas;