Alias fill(G) for text

Author: weiji14

pygmt/base_plotting.py

@@ -813,7 +813,7 @@ def legend(self, spec=None, position="JTR+jTR+o0.2c", box="+gwhite+p1p", **kwarg
             lib.call_module("legend", arg_str)
 
     @fmt_docstring
-    @use_alias(R="region", J="projection", B="frame", C="clearance", W="pen")
+    @use_alias(R="region", J="projection", B="frame", C="clearance", G="fill", W="pen")
     @kwargs_to_strings(
         R="sequence",
         textfiles="sequence_space",
@@ -888,6 +888,13 @@ def text(
             rounded rectangle. In paragraph mode (*paragraph*) you can also
             append lower case 'c' to get a concave rectangle or append upper
             case 'C' to get a convex rectangle.
+        fill : str
+            Sets the shade or color used for filling the text box [Default is
+            no fill]. Alternatively, use fill='c' to plot the text and then use
+            the text dimensions (and *clearance*) to build clip paths and turn
+            clipping on. This clipping can then be turned off later with clip
+            -C. To not plot the text but activate clipping, use fill='C'
+            instead.
         pen : str
             Sets the pen used to draw a rectangle around the text string
             (see *clearance*) [Default is width = default, color = black,

pygmt/tests/baseline/test_text_fill.png

@@ -131,6 +131,23 @@ def test_text_font_bold(region, projection):
     return fig
 
 
+@pytest.mark.mpl_image_compare
+def test_text_fill(region, projection):
+    """
+    Print text with blue color fill
+    """
+    fig = Figure()
+    fig.text(
+        region=region,
+        projection=projection,
+        x=1.2,
+        y=1.2,
+        text="blue fill around text",
+        fill="blue",
+    )
+    return fig
+
+
 @pytest.mark.mpl_image_compare
 def test_text_pen(region, projection):
     """