"The Commit that properly implements the disabling of Gui Elements"

Added enabled Field to DelegatingElement, which every instance can handle itself
Made isEnabled Field in GuiAdvancedTextField protected for subclasses to access
Made GuiDraggingNumberInput only draggable while enabled
Made GuiDropdown check enabled field before accepting mouse clicks
Properly tints GuiTexturedButton if disabled

src/main/java/eu/crushedpixel/replaymod/gui/elements/GuiDropdown.java

@@ -5,7 +5,6 @@ import eu.crushedpixel.replaymod.gui.elements.listeners.SelectionListener;
 import eu.crushedpixel.replaymod.utils.MouseUtils;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.FontRenderer;
-import net.minecraft.client.gui.GuiTextField;
 import org.lwjgl.input.Mouse;
 import org.lwjgl.util.Point;
 
@@ -140,6 +139,7 @@ public class GuiDropdown<T> extends GuiAdvancedTextField {
 
     public boolean mouseClickedResult(int xPos, int yPos) {
         boolean success = false;
+        if(!isEnabled) return success;
         if(xPos > xPosition + width - height && xPos < xPosition + width && yPos > yPosition && yPos < yPosition + height) {
             open = !open;
         } else {