factors in data.frames (PR#835)

The following seems to be a contradiction:

df <- data.frame(x=gl(2,1,10))
df[,1]

[1] 1 2 1 2 1 2 1 2 1 2
Levels:  1 2

df[,1,drop=F]

x
1  1
2  2
3  1
4  2
5  1
6  2
7  1
8  2
9  1
10 2

is.factor(df[,1,drop=F])

[1] FALSE

is.factor(df[,1])

[1] TRUE

with R1.2.1 both MS Windows and Intel RH5.2 versions.
 Jim

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