TextMesh Pro Left-aligned Text does not stay centered in its parents Layout Group, when Wrapping is Enabled

I want my Text to always be centered (vertical and horizontal) in a defined rectangle and never grow bigger than the defined horizontal borders.
The following screenshot visualizes the desired result:
My text is left-aligned, and the longest line of text defines the horizontal center point of the text.
The vertical center point is defined by the total amount of lines, or the height of the Rect-Transform.



To achieve this, I created an Image and added a Vertical Layout Group, and set Child Alignment to Middle Center and ticked Control Child Size Width and Height. (Since I only use the Layout Group to position and resize its one child (the text), I could also use a Horizontal Layout Group).
Then I added a TMP-Text as a Child of that Image. Done.

Limitation of my current solution:
The expected behavior only occurs when I do a manual line-break.
The problem is, when I use an auto-line-break (Wrapping set to Enabled), the Rect-Transform of the text grows to its maximum size, and does the line-break.



Now the text is not centered anymore. The distance between the word "text" and the right border is way bigger than the distance between the left border and the word "This".
I would expect that the text would be tightly surrounded by the Rect-Transform, as seen in the first screenshot.

How can I set up my left-aligned text to always be centered within a defined rectangle while also using auto-line-breaks?

 

I found a way to get very close to my desired solution.
Since I don't know if this is the ideal way of doing it, I will describe my current setup briefly and then describe the issue that I run into.

I create three Objects in my Hierarchy:
A TMP-Text Object (wrapping enabled) which is the Child of an other GameObject (lets call it LayoutParent) with a Vertical Layout Group (Child Alignment: Middle Center, Control Child Size: Width and Height).
LayoutParent is the Child of the "TextBox-Holder". This setup allows me to safely change the local position of LayoutParent with the following method.

Whenever I assign a new text to my Text Object, I force-update the Mesh and my Layout-Group. Then I get the textBounds and assign those to the local position of LayoutParent. Like so:

Code (CSharp):

1. using TMPro;
2. using UnityEngine;
3. using UnityEngine.UI;
4.  
5. public class DialogueTextFormatter : MonoBehaviour
6. {
7.     [SerializeField] TMP_Text tmpText;
8.     [SerializeField] RectTransform layoutParentRt;
9.  
10.     public void AssignNewString(string s)
11.     {
12.         tmpText.text = s;
13.  
14.         LayoutRebuilder.ForceRebuildLayoutImmediate(layoutParentRt);
15.         tmpText.ForceMeshUpdate();
16.  
17.         Bounds bounds = tmpText.textBounds;
18.         layoutParentRt.localPosition = -bounds.center;
19.     }
20. }

Pros:
Thanks to the Layout-Group, the max width of the text is restricted and Wrapping kicks in
The longest line of text will be horizontally centered, even with Wrapping enabled

Cons:
The text is not perfectly centered

I don't know why that is, but regardless of if I use `tmpText.bounds` or `tmpText.textBounds`, not all text will always be perfectly centered. I noticed that the x-value of the Center value of the bounds fluctuates. I saw values from -0.4 (when character "w" is at first position), and +1.4 (when character "!" is at first position).

Here is a very simple comparison. The text "!" is not exactly in the middle. ".textBounds.center.x" is 1.4. As a result, the text is too much to the left.


The text "w" causes a ".textBounds.center.x" of -0.4. As a result the text is slightly too much to the right.


So in addition to the original question, I now want to ask:
Is this the right attempt of solving this? And if so, how do I manage to get the text perfectly centered.

 

For anyone still looking for this, I posted my current solution here:
https://forum.unity.com/threads/ove...fit-in-the-maximum-width.716996/#post-6731824