patch 8.2.0593: finding a user command is not optimal

Problem:    Finding a user command is not optimal.
Solution:   Start further down in the list of commands.
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 2e35c8d..0c158e1 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1775,7 +1775,7 @@
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_FLAGS|EX_TRLBAR|EX_CMDWIN,
 	ADDR_LINES),
 
-// commands that don't start with a lowercase letter
+// commands that don't start with a letter
 EXCMD(CMD_bang,		"!",		ex_bang,
 	EX_RANGE|EX_WHOLEFOLD|EX_BANG|EX_FILES|EX_CMDWIN,
 	ADDR_LINES),
@@ -1800,6 +1800,11 @@
 EXCMD(CMD_at,		"@",		ex_at,
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_TRLBAR|EX_CMDWIN,
 	ADDR_LINES),
+EXCMD(CMD_tilde,	"~",		do_sub,
+	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_CMDWIN|EX_MODIFY,
+	ADDR_LINES),
+
+// commands that start with an uppercase letter
 EXCMD(CMD_Next,		"Next",		ex_previous,
 	EX_EXTRA|EX_RANGE|EX_COUNT|EX_BANG|EX_CMDARG|EX_ARGOPT|EX_TRLBAR,
 	ADDR_OTHER),
@@ -1809,9 +1814,6 @@
 EXCMD(CMD_X,		"X",		ex_X,
 	EX_TRLBAR,
 	ADDR_NONE),
-EXCMD(CMD_tilde,	"~",		do_sub,
-	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_CMDWIN|EX_MODIFY,
-	ADDR_LINES),
 
 #undef EXCMD
 
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index c70a433..25040df 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -3153,9 +3153,9 @@
     char_u *
 find_ex_command(
 	exarg_T *eap,
-	int *full UNUSED,
-	int (*lookup)(char_u *, size_t, cctx_T *) UNUSED,
-	cctx_T *cctx UNUSED)
+	int	*full UNUSED,
+	int	(*lookup)(char_u *, size_t, cctx_T *) UNUSED,
+	cctx_T	*cctx UNUSED)
 {
     int		len;
     char_u	*p;
@@ -3285,6 +3285,8 @@
 	    if (ASCII_ISLOWER(c2))
 		eap->cmdidx += cmdidxs2[CharOrdLow(c1)][CharOrdLow(c2)];
 	}
+	else if (ASCII_ISUPPER(eap->cmd[0]))
+	    eap->cmdidx = CMD_Next;
 	else
 	    eap->cmdidx = CMD_bang;
 
@@ -4766,7 +4768,7 @@
 
 /*
  * Check if "c" ends an Ex command.
- * In Vim9 script does not check for white space before #.
+ * In Vim9 script does not check for white space before # or #{.
  */
     int
 ends_excmd(int c)
diff --git a/src/version.c b/src/version.c
index 0ca4f39..c3a0a19 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    593,
+/**/
     592,
 /**/
     591,