Vertext Count Error when Text cotent out of range

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
csharp, unity
Domain
game-dev

Research direction

Start at Text.OnPopulateMesh(VertexHelper toFill) and reproduce the reported vertex-count difference using the attached text content across Unity 2017.4.16, 2018.4.36, and 2020.3.16. Compare the in-range and out-of-range newline cases; the issue does not define a precise expected count or name a source file, so the desired correction needs clarification before implementation.

Written by the indexing model from the issue text.

Description

with Unity2018.4.36, I found that in the Text method OnPopulateMesh(VertexHelper toFill) , toFill.currentVertCount count RichText color tag text vertex when the content in this Text is out of range.
c524fe4fed5ce8aab5e79bedabfae5a

this is text test cotent:
4a0610496643601ea02f53b0c688512

in the range
dfb21eacdc41ff2bcb3f364773881be

out of range after input newline
813271152828278a99b8790623649ed

Then I tested with Unity2017.4.16 and Unity2020.3.16.
Unity2020.3.16 is same as Unity2018.4.36,
but Unity2017.4.16 always count RichText color tag text vertex.

Dominant language
C#
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