wxGTK fixes

The GLCanvas for the check needs to be properly shown to create the context on wxGTK, so pop it up momentarily in a wxMiniFrame

Also fixed a PaletteCanvas issue

src/Application/SLADEWxApp.cpp

@@ -111,11 +111,11 @@ class SLADELog : public wxLog
 	void DoLogText(const wxString& msg) override
 	{
 		if (msg.Lower().Contains("error"))
-			log::error(msg.Right(msg.size() - 10));
+			log::error("wxWidgets: " + msg.Right(msg.size() - 10));
 		else if (msg.Lower().Contains("warning"))
-			log::warning(msg.Right(msg.size() - 10));
+			log::warning("wxWidgets: " + msg.Right(msg.size() - 10));
 		else
-			log::info(msg.Right(msg.size() - 10));
+			log::info("wxWidgets: " + msg.Right(msg.size() - 10));
 	}
 
 public:

src/MainEditor/UI/MainWindow.cpp

@@ -695,10 +695,16 @@ void MainWindow::onSize(wxSizeEvent& e)
 	// Test creation of OpenGL context
 	if (!opengl_test_done && e.GetSize().x > 20 && e.GetSize().y > 20)
 	{
-		auto test_canvas = new GLCanvas(this);
-		test_canvas->Show();
+		auto mf = new wxMiniFrame(this, -1, "OpenGL Test", wxDefaultPosition, { 32, 32 });
+		mf->SetSizer(new wxBoxSizer(wxVERTICAL));
+
+		auto test_canvas = new GLCanvas(mf);
+		mf->GetSizer()->Add(test_canvas, wxSizerFlags(1).Expand());
+
+		mf->Show();
 		test_canvas->activateContext();
-		delete test_canvas;
+		mf->Close(true);
+
 		opengl_test_done = true;
 	}
 

src/UI/Canvas/PaletteCanvas.cpp

@@ -131,6 +131,10 @@ void PaletteCanvas::updateBuffer(bool force)
 	int  y_size      = height / rows;
 	auto square_size = std::min<int>(x_size, y_size);
 
+	// Check canvas is large enough to display the palette
+	if (square_size < 3)
+		return;
+
 	// If the size hasn't changed we don't need to update the buffer
 	if (!force && rows == rows_ && cols == cols_ && square_size == square_size_)
 		return;