void refresh(int bitSize, int bitOffset) {
		updatePreferredSize();
		bitFieldAllocation = new BitFieldAllocation(bitSize, bitOffset);
		repaint();
	}
Refresh the bitfield allocation following an {@link #editMode} change.
When {@link #editMode} is not {@link EditMode#NONE} the specified
bitSize and bitOffset specify the active edit bitfield.
@param bitSize component bitsize
@param bitOffset component lsb bit offset from lsb of allocation unit
(allocation unit size is determine by current {@link #allocationByteSize}).
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/BitFieldPlacementComponent.java