#2526 Wrong mouseformat 2 in logscale!?

[theozh]

According to documentation, with the set mouse mouseformat 2 you should get

2 graph coordinates (from 0 to 1) /0.00, 1.00/

For the edge points of the graph this seems to be correct.
However, not for graphs with a logarithmic axis and positions between graph 0 and graph 1.

### wrong mouseformat 2 in logscale
reset session

set xrange [0:1]
set yrange [0.01:1]
set logscale y
set grid x,y
set mouse mouseformat 2

plot x
### end of code

# x    y    mouseX  mouseY
  0.0  0.01  0.0     0.0        # correct
  1.0  0.01  1.0     0.0        # correct
  1.0  1.0   1.0     1.0        # correct
  0.0  1.0   0.0     1.0        # correct
  0.0  0.1   0.0     0.0916     # however, mouseY should be 0.5
  0.5  0.1   0.5     0.0916     # however, mouseY should be 0.5