Fixes #4731: Take the position where the user clicked the handle into account when calculating the new scrollbar position.

Also fixes: The scrollbar did not subtract the handle height when determining the available space for moving the handle, thus introducing drift the further down a user scrolled.
Also fixes: The scrollbar did not resize it's trackbar when the ME inventory screens were resized and the number of rows changed, same for craft confirm.

src/main/java/appeng/client/gui/implementations/CraftConfirmScreen.java

@@ -97,6 +97,8 @@ public class CraftConfirmScreen extends AEBaseScreen<CraftConfirmContainer> {
 
         addButton(new Button(this.guiLeft + 6, this.guiTop + this.ySize - 25, 50, 20, GuiText.Cancel.text(),
                 btn -> subGui.goBack()));
+
+        this.setScrollBar();
     }
 
     @Override

src/main/java/appeng/client/gui/implementations/InterfaceTerminalScreen.java

@@ -71,8 +71,7 @@ public class InterfaceTerminalScreen extends AEBaseScreen<InterfaceTerminalConta
     public InterfaceTerminalScreen(InterfaceTerminalContainer container, PlayerInventory playerInventory,
             ITextComponent title) {
         super(container, playerInventory, title);
-        final Scrollbar scrollbar = new Scrollbar();
-        this.setScrollBar(scrollbar);
+        this.setScrollBar(new Scrollbar().setLeft(175).setTop(18).setHeight(106));
         this.xSize = 195;
         this.ySize = 222;
     }
@@ -81,10 +80,6 @@ public class InterfaceTerminalScreen extends AEBaseScreen<InterfaceTerminalConta
     public void init() {
         super.init();
 
-        this.getScrollBar().setLeft(175);
-        this.getScrollBar().setHeight(106);
-        this.getScrollBar().setTop(18);
-
         this.searchField = new AETextField(this.font, this.guiLeft + 104, this.guiTop + 4, 65, 12);
         this.searchField.setEnableBackgroundDrawing(false);
         this.searchField.setMaxStringLength(25);

src/main/java/appeng/client/gui/implementations/MEMonitorableScreen.java

@@ -283,6 +283,8 @@ public class MEMonitorableScreen<T extends MEMonitorableContainer> extends AEBas
         craftingGridOffsetX -= 25;
         craftingGridOffsetY -= 6;
 
+        this.setScrollBar();
+
     }
 
     @Override