Include 'perfect' mode in tree placer setting helptext

src/lang/extra/english.txt

@@ -8,6 +8,9 @@ STR_ORDER_TEXT                                                  :{STRING6} {STRI
 ##after STR_CONFIG_SETTING_TREE_PLACER_IMPROVED
 STR_CONFIG_SETTING_TREE_PLACER_PERFECT                          :Perfect
 
+##after STR_CONFIG_SETTING_TREE_PLACER_HELPTEXT
+STR_CONFIG_SETTING_TREE_PLACER_HELPTEXT_EXTRA                   :{STRING}, 'Perfect' improves spreading and grouping
+
 ##after STR_FINANCES_SECTION_OTHER
 STR_FINANCES_SECTION_INFRASTRUCTURE_COSTS                       :{GOLD}Infrastructure Sharing
 STR_FINANCES_SECTION_INFRASTRUCTURE_INCOME                      :{GOLD}Infrastructure Sharing

src/settings.cpp

@@ -1897,6 +1897,19 @@ static bool ZoomMaxCfgName(SettingOnGuiCtrlData &data)
 	}
 }
 
+static bool TreePlacerSettingGUI(SettingOnGuiCtrlData &data)
+{
+	switch (data.type) {
+		case SOGCT_DESCRIPTION_TEXT:
+			SetDParam(0, data.text);
+			data.text = STR_CONFIG_SETTING_TREE_PLACER_HELPTEXT_EXTRA;
+			return true;
+
+		default:
+			return false;
+	}
+}
+
 /* End - GUI callbacks */
 
 /**

src/table/settings/settings.ini

@@ -88,6 +88,7 @@ static bool LinkGraphDistributionSettingGUI(SettingOnGuiCtrlData &data);
 static bool OrderTownGrowthRate(SettingOnGuiCtrlData &data);
 static bool AllowRoadStopsUnderBridgesSettingGUI(SettingOnGuiCtrlData &data);
 static bool ZoomMaxCfgName(SettingOnGuiCtrlData &data);
+static bool TreePlacerSettingGUI(SettingOnGuiCtrlData &data);
 
 /* End - GUI callbacks */
 
@@ -3873,6 +3874,7 @@ str      = STR_CONFIG_SETTING_TREE_PLACER
 strhelp  = STR_CONFIG_SETTING_TREE_PLACER_HELPTEXT
 strval   = STR_CONFIG_SETTING_TREE_PLACER_NONE
 cat      = SC_BASIC
+guiproc  = TreePlacerSettingGUI
 
 [SDT_VAR]
 var      = game_creation.heightmap_rotation