[gnome-calculator] Fixed degree unit conversions (#211)

[Robert Roth <robertroth src gnome org>]

commit f5f355259280051b19be2c6afae09ec13d564ec8
Author: Robert Roth <robert roth off gmail com>
Date:   Mon Mar 8 10:55:26 2021 +0200

    Fixed degree unit conversions (#211)

 lib/equation-lexer.vala | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
---
diff --git a/lib/equation-lexer.vala b/lib/equation-lexer.vala
index 6c2a5f02..36e8d9bd 100644
--- a/lib/equation-lexer.vala
+++ b/lib/equation-lexer.vala
@@ -142,7 +142,7 @@ public class PreLexer : Object
         if (c == '½' || c == '⅓' || c == '⅔' || c == '¼' || c == '¾' || c == '⅕' || c == '⅖' || c == '⅗' || 
c == '⅘' || c == '⅙' || c == '⅚' || c == '⅛' || c == '⅜' || c == '⅝' || c == '⅞')
             return LexerTokenType.PL_FRACTION;
 
-        if (c == '°')
+        if (c == '˚' || c == '°')
             return LexerTokenType.PL_DEGREE;
 
         if (c == '\'')
@@ -381,6 +381,7 @@ public class Lexer : Object
 
         /* Ignore whitespace */
         var type = prelexer.get_next_token ();
+
         while (type == LexerTokenType.PL_SKIP)
         {
             prelexer.set_marker ();
@@ -448,6 +449,13 @@ public class Lexer : Object
         if (type == LexerTokenType.PL_LETTER)
             return insert_letter ();
 
+        if (type == LexerTokenType.PL_DEGREE)
+        {
+            type = prelexer.get_next_token ();
+            if ((type == LexerTokenType.PL_HEX || type == LexerTokenType.PL_LETTER) && check_if_unit ())
+                return insert_token (LexerTokenType.UNIT);
+        }
+
         if (type == LexerTokenType.PL_EOS)
             return insert_token (LexerTokenType.PL_EOS);