Improve layout for reference axes with very vertically small windows.

src/drawentity.cpp

@@ -587,6 +587,11 @@ void Entity::Draw(DrawAs how, Canvas *canvas) {
                     double s = camera.scale;
                     double h = 60 - camera.height / 2.0;
                     double w = 60 - camera.width  / 2.0;
+                    // Shift the axis to the right if they would overlap with the toolbar.
+                    if(SS.showToolbar) {
+                        if(h + 30 > -(34*16 + 3*16 + 8) / 2)
+                            w += 60;
+                    }
                     tail = camera.projRight.ScaledBy(w/s).Plus(
                            camera.projUp.   ScaledBy(h/s)).Minus(camera.offset);
                 } else {

src/toolbar.cpp

@@ -151,6 +151,7 @@ bool GraphicsWindow::ToolbarDrawOrHitTest(int mx, int my, UiCanvas *canvas,
 
     int x = 17, y = (int)(height - 52);
 
+    // When changing these values, also change the asReference drawing code in drawentity.cpp.
     int fudge = 8;
     int h = 34*16 + 3*16 + fudge;
     int aleft = 0, aright = 66, atop = y+16+fudge/2, abot = y+16-h;

test/harness.cpp

@@ -363,6 +363,7 @@ int main(int argc, char **argv) {
         }
 
         SS.Init();
+        SS.showToolbar = false;
         SS.checkClosedContour = false;
 
         Test::Helper helper = {};