Add themeGray()

Author: MKoroteev-HORIS

future_changes.md

@@ -8,7 +8,9 @@ GeoTools [v 33.2](https://github.com/geotools/geotools/releases/tag/33.2)
 ### Changed
 
 - Plot Theme:
-   
+ 
+  - `themeGray()` as an alias for `themeGrey()`.
+
   - New `theme` functions for setting legend justification: `legendJustificationTop()`, `legendJustificationRight()`, <br>
   `legendJustificationBottom()`, and `legendJustificationLeft()`.
 

plot-api/src/commonMain/kotlin/org/jetbrains/letsPlot/themes/themeSet.kt

@@ -12,7 +12,7 @@ import org.jetbrains.letsPlot.intern.OptionsMap
 
 
 /**
- * Grey background and white gridlines.
+ * Grey background and white gridlines. The same as themeGray().
  *
  * ## Examples
  *
@@ -25,6 +25,20 @@ fun themeGrey() = OptionsMap(
 )
 
 
+/**
+ * Gray background and white gridlines. The same as themeGrey().
+ *
+ * ## Examples
+ *
+ * - [themes.ipynb](https://nbviewer.org/github/JetBrains/lets-plot-docs/blob/master/source/kotlin_examples/cookbook/complete_themes.ipynb)
+ */
+fun themeGray() = OptionsMap(
+    kind = Option.Plot.THEME,
+    name = Option.Theme.Name.R_GRAY,
+    emptyMap()
+)
+
+
 /**
  * Grey lines on white background with dark grey plot border.
  *