gidx_to_string doesn't allocate enough memory

[Algunenano]

Manifested in some logs:

got boxes GIDX( 4.99354171753 1.33285224438 -3.40282346639e+38 3.34260988235, 91.8126296997 100.783157349 3.40282346639e+38 98.150138855 )� and GIDX( 67.4631118774 3.76653146744, 76.9421615601 23.6310768127 )


got boxes GIDX( 7.67286014557 3.55379080772 -3.40282346639e+38 1.00054788589, 96.2146835327 99.1751022339 3.40282346639e+38 94.6226959229 �

For " %.12g" you need at most 20 chars, but is reserving only 15.

Code has been this way since it was introduced, so all supported releases are affected.

[Algunenano]

All supported releases are affected

[Raul Marin]

In 17015:

Allocate enough memory in gidx_to_string

References #4236

[Raul Marin]

In 17016:

Allocate enough memory in gidx_to_string

References #4236

[Raul Marin]

In 17017:

Allocate enough memory in gidx_to_string

References #4236

[Raul Marin]

In 17018:

Allocate enough memory in gidx_to_string

References #4236

[Raul Marin]

In 17019:

Allocate enough memory in gidx_to_string

Close #4236