Add strikethrough TextStyling

Closes #12369

doc_src/cmds/set_color.rst

@@ -54,6 +54,9 @@ The following options are available:
 **-r** or **--reverse**
     Sets reverse mode.
 
+**-s** or **--strikethrough**
+    Sets strikethrough mode.
+
 **-u** or **--underline**, or **-uSTYLE** or **--underline=STYLE**
     Set the underline mode; supported styles are **single** (default), **double**, **curly**, **dotted** and **dashed**.
 

doc_src/interactive.rst

@@ -110,6 +110,7 @@ Options accepted by ``set_color`` like
 ``--dim``,
 ``--italics``,
 ``--reverse``,
+``--strikethrough``,
 ``--underline`` and
 ``--underline-color=``
 are also accepted.

doc_src/terminal-compatibility.rst

@@ -92,7 +92,7 @@ Optional Commands
 
    * - ``\e[m``
      - sgr0
-     - Turn off bold/dim/italic/underline/reverse attribute modes and select default colors.
+     - Turn off bold/dim/italic/underline/strikethrough/reverse attribute modes and select default colors.
    * - ``\e[1m``
      - bold
      - Enter bold mode.
@@ -120,12 +120,18 @@ Optional Commands
    * - ``\e[7m``
      - rev
      - Enter reverse video mode (swap foreground and background colors).
+   * - ``\e[9m``
+     - smxx
+     - Enter strikethrough mode
    * - ``\e[23m``
      - ritm
      - Exit italic mode.
    * - ``\e[24m``
      - rmul
      - Exit underline mode.
+   * - ``\e[29m``
+     - rmxx
+     - Exit strikethrough mode.
    * - ``\e[38;5; Ps m``
      - setaf
      - Select foreground color Ps from the 256-color-palette.