fmt: extraneous + printing with %0f

[gopherbot]

by oliver.eilhard:

What does 'go version' print?
go version go1.3rc2 linux/amd64

What steps reproduce the problem?
Link: http://play.golang.org/p/6WFe3GJJVS

1. Run the program above with go 1.2.2
2. Run the program again with go 1.3rc2
3. Notice the differences in output.

What happened?
Go 1.2.2 prints:
<input type="hidden" name="NEW_ITEM-PRICE[1]"
value="00000000015.780"/>

Go 1.3rc2 prints:
<input type="hidden" name="NEW_ITEM-PRICE[1]"
value="&#43;0000000015.780"/>

What should have happened instead?
Go 1.3rc2 should print the same as Go 1.2.2:
<input type="hidden" name="NEW_ITEM-PRICE[1]"
value="00000000015.780"/>

[gopherbot]

Comment 1 by oliver.eilhard:

Dan Kortschak added on go-nuts:
It was introduced in:
changeset:   20036:e8b79e17dc85 
user:        Rob Pike <r...@golang.org> 
date:        Wed May 21 12:30:43 2014 -0700 
summary:     fmt: fix floating-point padding once and for all

[kortschak]

Comment 2:

Simple reproducer: http://play.golang.org/p/xI8QZCb_-w

[kortschak]

Comment 3:

I'm working on this, but I'd like to know whether the correct behaviours for the
following two cases are:
"%07.2f", 1 + 2i -> "(0001.00+002.00i)"
"%07.2f", 1.0 -> "0001.00"

[ianlancetaylor]

Comment 4:

Labels changed: added repo-main, release-go1.4.

[robpike]

Comment 5:

package main
import "fmt"
func main() {
    fmt.Printf("%015.3f", 1.0)
}
is all you need.

[robpike]

Comment 6:

Owner changed to @robpike.

[gopherbot]

Comment 7:

CL https://golang.org/cl/103480043 mentions this issue.

[robpike]

Comment 8:

This issue was closed by revision b559392.

Status changed to Fixed.

[gopherbot]

Comment 9:

CL https://golang.org/cl/110040043 mentions this issue.

[gopherbot]

Comment 10:

CL https://golang.org/cl/105310043 mentions this issue.

[adg]

Comment 11:

This issue was closed by revision 6b9d2b9bb54e.