Display footnote labels as superscripts

A new counter type \superarabic is introduced, that transforms the
counter into superscript Unicode numbers.

This is used for the footnote counter.

The Foot inset layout is modified to use an empty LabelString (in size
Normal, since the numbers could be too small).

We use this occasion to set footnote text in footnotesize, as it should.

A couple of changes are done to the code to make the button label and
tooltip look better.

Fixes bug #12238.

lib/layouts/numreport.inc

@@ -41,5 +41,4 @@ End
 Counter footnote
 	GuiName Footnote
 	Within		      chapter
-	LabelString	      "\arabic{footnote}"
 End

lib/layouts/stdcounters.inc

@@ -84,6 +84,7 @@ End
 
 Counter footnote
 	GuiName Footnote
+	LabelString          "\superarabic{footnote}"
 	PrettyFormat         "Footnote ##"
 End
 

lib/layouts/stdinsets.inc

@@ -49,17 +49,17 @@ InsetLayout Marginal
 End
 
 InsetLayout Foot
-	LabelString           Foot
+	LabelString           ""
 	LatexType             Command
 	LatexName             footnote
 	Counter               footnote
 	InheritFont 	      false
 	Font
-	  Size                Small
+	  Size                FootnoteSize
 	EndFont
 	LabelFont
 	  Color               footlabel
-	  Size                Small
+	  Size                Normal
 	EndFont
 	MultiPar              true
 	RefPrefix             fn

src/Counters.cpp

@@ -476,6 +476,9 @@ docstring Counters::labelItem(docstring const & ctr,
 	if (numbertype == "fnsymbol")
 		return fnsymbolCounter(val);
 
+	if (numbertype == "superarabic")
+		return superarabicCounter(val);
+
 	return convert<docstring>(val);
 }
 

src/insets/InsetFoot.cpp

@@ -88,7 +88,9 @@ void InsetFoot::updateBuffer(ParIterator const & it, UpdateType utype, bool cons
 	int val = cnts.value(count);
 	if (cnts.hasCounter(count)) {
 		cnts.step(count, utype);
-		custom_label_ += ' ' + cnts.theCounter(count, lang->code());
+		if (!custom_label_.empty())
+			custom_label_ += ' ';
+		custom_label_ += cnts.theCounter(count, lang->code());
 		if (deleted)
 			// un-step after deleted counter
 			cnts.set(count, val);
@@ -107,7 +109,7 @@ docstring InsetFoot::toolTip(BufferView const & bv, int x, int y) const
 	if (isOpen(bv))
 		// this will give us something useful if there is no button
 		return InsetCollapsible::toolTip(bv, x, y);
-	return toolTipText(custom_label_+ ": ");
+	return toolTipText(custom_label_+ " ");
 }
 
 

src/support/counter_reps.cpp

@@ -12,6 +12,8 @@
 #include <config.h>
 
 #include "support/counter_reps.h"
+
+#include "support/convert.h"
 #include "support/docstring.h"
 #include "support/lstrings.h"
 
@@ -132,4 +134,15 @@ docstring const fnsymbolCounter(int const n)
 	};
 }
 
+
+docstring const superarabicCounter(int const n)
+{
+	docstring superarabic = convert<docstring>(n);
+	static char_type map[] = {0x2070, 0x00b9, 0x00b2, 0x00b3, 0x2074,
+	                          0x2075, 0x2076, 0x2077, 0x2078, 0x2079 };
+	for (char_type & c : superarabic)
+		c = map[c - char_type('0')];
+	return superarabic;
+}
+
 } // namespace lyx

src/support/counter_reps.h

@@ -27,6 +27,7 @@ char hebrewCounter(int const n);
 docstring const romanCounter(int const n);
 docstring const lowerromanCounter(int const n);
 docstring const fnsymbolCounter(int const n);
+docstring const superarabicCounter(int const n);
 
 } // namespace lyx