Fix button placement in minimized in-game windows

Some windows position their buttons based on GetSize().y, which results
in incorrect placement if the window is persisted and minimized.
Replace uses of GetSize().y with the full window height.

Affected windows:
* iwBuildings
* iwDistribution
* iwWares

libs/s25main/ingameWindows/iwBuildings.cpp

@@ -25,8 +25,9 @@
 #include "gameData/BuildingProperties.h"
 #include "gameData/const_gui_ids.h"
 
+namespace {
 /// Reihenfolge der Gebäude
-const std::array<BuildingType, 32> bts = {
+constexpr std::array<BuildingType, 32> bts = {
   BuildingType::Barracks,      BuildingType::Guardhouse, BuildingType::Watchtower,     BuildingType::Fortress,
   BuildingType::GraniteMine,   BuildingType::CoalMine,   BuildingType::IronMine,       BuildingType::GoldMine,
   BuildingType::LookoutTower,  BuildingType::Catapult,   BuildingType::Woodcutter,     BuildingType::Fishery,
@@ -41,14 +42,17 @@ const std::array<BuildingType, 32> bts = {
 };
 
 // Abstand des ersten Icons vom linken oberen Fensterrand
-const DrawPoint iconPadding(30, 40);
+constexpr DrawPoint iconPadding(30, 40);
 // Abstand der einzelnen Symbole untereinander
-const DrawPoint iconSpacing(40, 48);
+constexpr DrawPoint iconSpacing(40, 48);
 // Abstand der Schriften unter den Icons
-const unsigned short font_distance_y = 20;
+constexpr unsigned short font_distance_y = 20;
+
+constexpr auto BuildingsWindowSize = Extent(185, 480);
+} // namespace
 
 iwBuildings::iwBuildings(GameWorldView& gwv, GameCommandFactory& gcFactory)
-    : IngameWindow(CGI_BUILDINGS, IngameWindow::posLastOrCenter, Extent(185, 480), _("Buildings"),
+    : IngameWindow(CGI_BUILDINGS, IngameWindow::posLastOrCenter, BuildingsWindowSize, _("Buildings"),
                    LOADER.GetImageN("resource", 41)),
       gwv(gwv), gcFactory(gcFactory)
 {
@@ -69,8 +73,8 @@ iwBuildings::iwBuildings(GameWorldView& gwv, GameCommandFactory& gcFactory)
 
     // Hilfe-Button
     Extent btSize = Extent(30, 32);
-    AddImageButton(32, GetSize() - DrawPoint(14, 20) - btSize, btSize, TextureColor::Grey, LOADER.GetImageN("io", 225),
-                   _("Help"));
+    AddImageButton(32, BuildingsWindowSize - DrawPoint(14, 20) - btSize, btSize, TextureColor::Grey,
+                   LOADER.GetImageN("io", 225), _("Help"));
 }
 
 /// Anzahlen der Gebäude zeichnen

libs/s25main/ingameWindows/iwDistribution.cpp

@@ -27,11 +27,15 @@ struct iwDistribution::DistributionGroup
 };
 std::vector<iwDistribution::DistributionGroup> iwDistribution::groups;
 
+namespace {
 /// Dertermines width of the progress bars: distance to the window borders
-const unsigned PROGRESS_BORDER_DISTANCE = 20;
+constexpr unsigned PROGRESS_BORDER_DISTANCE = 20;
+
+constexpr auto DistributionWindowSize = Extent(290, 312);
+} // namespace
 
 iwDistribution::iwDistribution(const GameWorldViewer& gwv, GameCommandFactory& gcFactory)
-    : TransmitSettingsIgwAdapter(CGI_DISTRIBUTION, IngameWindow::posLastOrCenter, Extent(290, 312),
+    : TransmitSettingsIgwAdapter(CGI_DISTRIBUTION, IngameWindow::posLastOrCenter, DistributionWindowSize,
                                  _("Distribution of goods"), LOADER.GetImageN("resource", 41)),
       gwv(gwv), gcFactory(gcFactory)
 {
@@ -63,11 +67,11 @@ iwDistribution::iwDistribution(const GameWorldViewer& gwv, GameCommandFactory& g
 
     const Extent btSize(32, 32);
     // Hilfe
-    AddImageButton(2, DrawPoint(15, GetSize().y - 15 - btSize.y), btSize, TextureColor::Grey,
+    AddImageButton(2, DrawPoint(15, DistributionWindowSize.y - 15 - btSize.y), btSize, TextureColor::Grey,
                    LOADER.GetImageN("io", 225), _("Help"));
     // Standardbelegung
-    AddImageButton(10, GetSize() - DrawPoint::all(15) - btSize, btSize, TextureColor::Grey, LOADER.GetImageN("io", 191),
-                   _("Default"));
+    AddImageButton(10, DistributionWindowSize - DrawPoint::all(15) - btSize, btSize, TextureColor::Grey,
+                   LOADER.GetImageN("io", 191), _("Default"));
 
     iwDistribution::UpdateSettings();
 }

libs/s25main/ingameWindows/iwWares.cpp

@@ -131,10 +131,10 @@ iwWares::iwWares(unsigned id, const DrawPoint& pos, const Extent& size, const st
     }
 
     // "Blättern"
-    AddImageButton(0, DrawPoint(52, GetSize().y - 47), Extent(66, 32), TextureColor::Grey, LOADER.GetImageN("io", 84),
+    AddImageButton(0, DrawPoint(52, size.y - 47), Extent(66, 32), TextureColor::Grey, LOADER.GetImageN("io", 84),
                    _("Next page"));
     // Hilfe
-    AddImageButton(12, DrawPoint(16, GetSize().y - 47), Extent(32, 32), TextureColor::Grey, LOADER.GetImageN("io", 225),
+    AddImageButton(12, DrawPoint(16, size.y - 47), Extent(32, 32), TextureColor::Grey, LOADER.GetImageN("io", 225),
                    _("Help"));
 
     waresPage.SetVisible(true);