[Feature] Support automatic line breaks for merged cells as well

[zhangxianzhong]

Initial checklist

• Is this really a problem?
• I have searched the Github Issues for similar issues, but did not find anything.

Problem

I want to use Univer to display multiple rows of data, but the number of cells required for each row is different, so I need to merge cells. After merging the cells, setting automatic line breaks does not work, and it cannot fully display the text content. I hope it can provide the same feature as Luckysheet, where merged cells automatically wrap text.

[jikkai]

This behavior is somewhat similar to a border: merged cells must be configured with the same attributes for it to work properly. If you are certain that this feature has not been implemented, please provide a minimal reproduction.

[zhangxianzhong]

sorry, my description is a bit wrong, after the merged cells wrap automatically, the height is fixed, and the height cannot be adapted

[zhangxianzhong]

我看了0.4.2的源码，发现合并后的单元格在计算自动高度的时候直接跳过了，看是否可以在下个版本中调整优化一下，这个场景其实还挺常见的，之间的luckysheet似乎就可以

[univer-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

I looked at the source code of 0.4.2 and found that the merged cells were skipped when calculating the automatic height. I will see if it can be adjusted and optimized in the next version. This scenario is actually quite common. The luckysheet seems to be That's it

[lumixraku]

It was done this way on purpose, which is consistent with Microsoft Excel.