private int getLeftByteChop() {
			if (editUseEnabled) {
				return 0;
			}
			if (visibleArea.width == 0) {
				// component not yet contained witin scroll pane
				return allocationByteSize - 1;
			}
			int visibleStart = visibleArea.x;
			return (visibleStart / byteWidth);
		}
Get the number of bytes contained within the allocationByteSize which
are not visible on the left side.  When edit use is enabled the left
will always be zero regardless of visibility.
@return number of allocation bytes chopped from left
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/BitFieldPlacementComponent.java