Allow ignoring boundary box size for arrange function

Related issue: https://bugs.launchpad.net/inkscape/+bug/170835

Patch tested with r13573 on OS X 10.7.5

It seems a useful feature to add. The new option AFAICT works as described - one issue I noticed is that the x,y position of the rearranged selection changes unexpectedly:

Steps to demonstrate the offset:
1) select objects to be arranged
2) set options as needed, check "[x] Ignore Box Size"
3) click on 'Arrange' repeatedly

Expected result:
No further changes after objects have been arranged the first time

Actual result:
The relative arrangement stays unchanged, but the selection as a whole is offset each time the button is pressed again.

The direction and the amount of the offset seems to vary depending on the values set for the x and y spacings.

I also noticed a small typo in the patch:
'on_ingore_box_checkbutton_changed' instead of 'on_ignore_box_checkbutton_changed'

Thanks for the feedback!

This updated patch fixes the following:
* The global shift issue
* the typo
* layout of UI of WITH_GTKMM_3_0, note: still not tested

Further reviews of this patch are welcomed. :)

While testing the second version of the patch (offset issue is fixed, GTK3 compiles and is functional), I was wondering whether it would make sense to make this option affect more than just the x, y spacing:

Currently, the alignment options are based on the largest bounding box of the selected objects, independent of whether the spacing is absolute, or based on the same bounding box size.

What about making the alignment relative to the cells of the grid too, if 'Ignore Box SIze' is checked? This would allow to align objects to the center right (or e.g. the bottom left) of a 'grid cell'.

On 2014-10-03 11:53 (+0100), ~suv wrote:> What about making the alignment relative to the cells of the grid too,
> if 'Ignore Box SIze' is checked? This would allow to align objects to
> the center right (or e.g. the bottom left) of a 'grid cell'.

Nevermind, I figured out how to achieve such an effect with the current patch as is (align objects first (within selection) based on the targeted alignment of 'Rows and Columns').