CSV rendering for TSV files does not show rows with empty fields

[richmahn]

• Gitea version (or commit ref): 4b6370c (main)
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No

TSV (bad rendering): https://try.gitea.io/richmahn/test/src/branch/master/empty_fields.tsv

CSV (works): https://try.gitea.io/richmahn/test/src/branch/master/empty_fields.csv

Description

If a TSV file's row has fields that are empty (i.e. two tabs with no characters in-between), the row gets flagged by the CSV parser as not having the right number of fields:

record on line 3: wrong number of fields

For a CSV file (actual comma delimited) it is ok with empty fields.

The following raw text fails for TSV render despite having the right number of tabs (3) each row:

Row	Field1	Field2	Field3
1	a	b	c
2		d	f
3	g	h	i
4		k	l
5	m	n	
6	p	q	r
7			u
8	v	w	x
9	z		
10			

NOTE: THIS WORKED OK ON GITEA v1.14.X!

Screenshots

Missing rows:

[richmahn]

Found this is due to this line, which trims the tabs!

rd.TrimLeadingSpace = true

gitea/modules/csv/csv.go

Line 26 in 4b6370c

rd.TrimLeadingSpace = true