fix scroll bar not rendering

(why is the default thickness -1??)
also add extra line spacing after title

Author: ghzdude

src/main/java/gregtech/api/metatileentity/multiblock/ui/MultiblockUIBuilder.java

@@ -108,7 +108,7 @@ public MultiblockUIBuilder structureFormed(boolean structureFormed) {
     }
 
     public MultiblockUIBuilder title(String lang) {
-        addKey(KeyUtil.lang(TextFormatting.WHITE, lang));
+        addOperation(Operation.addLine(KeyUtil.lang(TextFormatting.WHITE, lang)).spaceLine(2));
         return this;
     }
 

src/main/java/gregtech/common/mui/widget/ScrollableTextWidget.java

@@ -19,6 +19,7 @@
 import com.cleanroommc.modularui.screen.viewport.ModularGuiContext;
 import com.cleanroommc.modularui.theme.TextFieldTheme;
 import com.cleanroommc.modularui.theme.WidgetTheme;
+import com.cleanroommc.modularui.theme.WidgetThemeEntry;
 import com.cleanroommc.modularui.utils.HoveredWidgetList;
 import com.cleanroommc.modularui.widget.Widget;
 import com.cleanroommc.modularui.widget.scroll.ScrollArea;
@@ -51,7 +52,7 @@ public ScrollableTextWidget() {
 
     @Override
     public void onInit() {
-        this.scroll.setScrollData(ScrollData.of(GuiAxis.Y));
+        this.scroll.setScrollData(ScrollData.of(GuiAxis.Y, false, 4));
     }
 
     @Override
@@ -189,8 +190,8 @@ private void drawText(ModularGuiContext context) {
     public void postDraw(ModularGuiContext context, boolean transformed) {
         if (!transformed) {
             Stencil.remove();
-            WidgetTheme theme = context.getTheme().getScrollbarTheme().getTheme(isHovering());
-            this.scroll.drawScrollbar(context, theme, theme.getBackground());
+            WidgetThemeEntry<WidgetTheme> theme = context.getTheme().getScrollbarTheme();
+            this.scroll.drawScrollbar(context, theme.getTheme(isHovering()), theme.getTheme().getBackground());
         }
     }