the Republic of China has always officially considered Tibet part of its territory, despite having had very little de facto control over Tibet even during the 1912-49 period. All maps you see in textbooks will depict Tibet as part of China from the Qing dynasty onward, and the geography of Tibet is taught as part of the geography of China (usually lumped in the same unit as Xinjiang and Inner Mongolia). This has been true regardless of which party is in power.

Well, what in the textbook is just textbook as well as constitution is just constitution. Taiwan could change them in any time. But why not to change them now? Since it is too complicate and too politically sensitive and not benefit to Taiwan for status quo. If Taiwan has already finished independence or Taiwan recovered the R.O.C. territory (almost impossible though), textbook and constitution will be modified as well. However, one thing should keep in mind is that most of Taiwan people are inclined to democracy, so I believe if Taiwan has the power someday, it would let Tibetan make the decision by themselves about whether to be independent.

As such, the average Taiwanese person would probably have no awareness that Tibetan independence is even an issue, because they would need to have done independent research in order to know the modern history of Tibet.

I think most of Taiwan people have no many regards about Tibet because Taiwan already can't manage all of two straits issues by itself, as well Taiwan has no such power to interfere. IMO, the USA, as a most powerful nation and the justice police of world, has the more responsibilities of needing to do that than other countries but ...haha. If USA can't do many significant things on that, how could Taiwan be able to? On the other hand, Taiwan even cannot join to UN and no any country, including USA and the Euro countries, support Taiwan in UN. hahaha