bug#37770: [PATCH] Expose scale factor through the redisplay interface

[Carlos Pita]

I have updated my patch a bit:

1. Instead of setting the new API to NULL when the scale factor is
ignored or unsupported by the backend, I'm setting it to a dummy
function returning 1. This keeps backwards compatibility and is more
convenient for the user of the interface.

2. get_scale_factor now returns a double. Even though current scale
factors are integers, this is an interface that will better have to
make it through the forthcoming era of fractional scaling.

0001-Expose-scale-factor-through-the-redisplay-interface.patch
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