Adding default cursor patch

README.md

@@ -15,6 +15,8 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
 
 ### Changelog:
 
+2021-05-11 - Added default cursor patch
+
 2021-05-10 - Upgrade to 46b02f, 2021-03-28
 
 2021-05-09 - Added the sync, alpha-focus-hightlight and vim browse patches
@@ -98,6 +100,10 @@ Refer to [https://st.suckless.org/](https://st.suckless.org/) for details on the
       - this patch allows you to select and copy the last URL displayed with Mod+l
       - multiple invocations cycle through the available URLs
 
+   - default-cursor
+      - minor change allowing escape sequences like `\e[ q` or `\e[0 q` to set the cursor back to default configuration instead of a blinking block
+      - while many terminals do this the behaviour is not according to the specification
+
    - [delkey](https://st.suckless.org/patches/delkey/)
       - return BS on pressing backspace and DEL on pressing the delete key
 

patches.def.h

@@ -80,6 +80,21 @@
  */
 #define COPYURL_HIGHLIGHT_SELECTED_URLS_PATCH 0
 
+/* According to the specification (see link in BLINKING_CURSOR_PATCH) the "Set cursor style
+ * (DECSCUSR), VT520." escape sequences define both values of 0 and 1 as a blinking block,
+ * with 1 being the default.
+ *
+ * This patch allows the default cursor to be set when value 0 is used, as opposed to
+ * setting the cursor to a blinking block.
+ *
+ * This allows a command like this to restore the cursor to what st is configured with:
+ *    $ echo -ne "\e[ q"
+ *
+ * While many terminal emulators do this it is not adhering to specification. xterm is an
+ * example terminal that sets a blinking block instead of the configured one, same as st.
+ */
+#define DEFAULT_CURSOR_PATCH 0
+
 /* Return BS on pressing backspace and DEL on pressing the delete key.
  * https://st.suckless.org/patches/delkey/
  */

x.c

@@ -2405,7 +2405,15 @@ xsetcursor(int cursor)
 	if (!BETWEEN(cursor, 0, 7)) /* 7: st extension */
 	#endif // BLINKING_CURSOR_PATCH
 		return 1;
+	#if DEFAULT_CURSOR_PATCH
+	#if BLINKING_CURSOR_PATCH
+	win.cursor = (cursor ? cursor : cursorstyle);
+	#else
+	win.cursor = (cursor ? cursor : cursorshape);
+	#endif // BLINKING_CURSOR_PATCH
+	#else
 	win.cursor = cursor;
+	#endif // DEFAULT_CURSOR_PATCH
 	#if BLINKING_CURSOR_PATCH
 	cursorblinks = win.cursor == 0 || win.cursor == 1 ||
 	               win.cursor == 3 || win.cursor == 5 ||