tweak farm-plot-select: Only show controls when plots are fully built

Fixes #521

NEWS

@@ -48,6 +48,7 @@ DFHack Future
           - fixed a crash on arena load
           - number keys (e.g. 2/8) take priority over cursor keys when applicable
         tweak fps-min fixed
+        tweak farm-plot-select: Stopped controls from appearing when plots weren't fully built
         workflow: Fixed some issues with stuck jobs
           - Note: Existing stuck jobs must be cancelled and re-added
         zone: Fixed a crash when using "zone set" (and a few other potential crashes)

plugins/tweak/tweaks/farm-plot-select.h

@@ -76,7 +76,10 @@ struct farm_select_hook : df::viewscreen_dwarfmodest {
     DEFINE_VMETHOD_INTERPOSE(void, render, ())
     {
         INTERPOSE_NEXT(render)();
-        if (!getFarmPlot() || !ui->selected_farm_crops.size())
+        auto farm_plot = getFarmPlot();
+        if (!farm_plot || !ui->selected_farm_crops.size())
+            return;
+        if (farm_plot->getBuildStage() != farm_plot->getMaxBuildStage())
             return;
         auto dims = Gui::getDwarfmodeViewDims();
         int x = dims.menu_x1 + 1,