Add label options to the Mapping dialog

[MeSophie]

Fixes partially #7695

@rdstern I corrected the error on label maping Dialog.

For the Label and Legend option can we add a check box Add Legend and Add Label? And please more information about the filter part will be very helpful. Thank you.

[rdstern]

@MeSophie I can now edit the labels, as you say.
But - oddly I can't change their size (or I think colour either).
Here is geom_label_repel

I think size and colour are geom parameters, but they seem not to be included in the list here. I will check, but I wonder also if we need all that are there, because the list is already long. OIf not, then perhaps include size and colour instead of max_time and max_iter which I think we are unlikely to need often.

If you make this change, can you do the same for geom_text_repel at the same time. In the dialogue I would like to be able to choose between the two.

Then I tried explaining the filter options in detail and it is going to become complicated to implement. So leave that for now.

So just add the option for now to use geom_text_repel or label_repel.

I suggest a box under the data selector shown above. It could be called Label Options: Inside, perhaps 3 options
a) Checkbox labelled Rectangle, defualt checked. (If checked, the geom-label repel, otherwise geom +text)repel.
b) Size, to be able to change the size of the labels, if works well. Up-dowen control as in the sub-dialogue.
c) Checkbox with label All Default unchecked. If checked then I think it is the Max Overlaps you can have as Inf and it then shows all of them? (Please check if I have this right.)

[MeSophie]

@rdstern I'm done with improvements. Please can you check.
max.overlaps = Inf is working well I try it with this code in r.

- Without max.overlaps = Inf

- With max.overlaps = Inf

[rdstern]

@MeSophie this is exciting. And looking great.
a) Change the Label Rectangle to Text and have it unchecked by default. It also doesn't remember the setting, so make it do that.
b) Have a checkbox, default unchecked for the Size option - as it is in the sub-dialogue. When checked make the default 5, (as for the nlabel and text geoms, in both the dialogue and the sub-dialogue.)
c) The Label All doesn't remember the previous setting. Make it do this.
d) The R-text calls the geom_label_repel twice. I think that may be resulting in the text option not working (ot always gives a label). And the size doesn't seem to work, from the main dialogue. It does work from the sub-dialogue.
e) Could you move the box up so it starts just below the data selector. That will give space for a 4th checkbox, with a copy of the Colour option from the sub-dialogue!

[rdstern]

@MeSophie This is looking excellent now.
There are just some option settings to tweal a bit and then you are through!
a) The default is correctly with the Text unchecked, and therefore it should be a label - so with the box round the names. Currently the default (when it is unchecked) is now Text. I would like the user to have to check to get the text.
b) Then sometimes the Colour and size reset to their default of Black and 5. And sometimes they remember the previous setting. I think they may remember for text and not for label, but I am not sure?

[MeSophie]

@rdstern Please can you check the new changes? Thank you.

[rdstern]

@MeSophie very nice now. Many thanks. I hope @lloyddewit will like the code.