Currently ADVMemo simply inserts spaces to the value of of the TabSize from the current cursor position. Please can I request an option for aligned tabs so that the first tab is foreshortened to align to the next tab position. This more closely represents the behaviour of tabs in word processors and makes it much easier to align columns.
Has a significant impact on current architecture but we'll consider this for a future update.
I came to the same conclusion. I worked around it in the KeyDown event, calc the offset to the first Tab from cursor position and adjust the Tabsize. If already aligned I restore the tab size to the initial tabsize. Seems to work and I haven't found any undesired effect.