patch 9.1.1896: tests: patch v9.1.1895 breaks CI

Problem:  tests: patch v9.1.1895 breaks CI, by failing screen dump tests
          test_listlbr_utf8, test_diffmode and test_cmdline
Solution: Revert it

Revert "patch 9.1.1895: OSC terminal response hard to detect"
This reverts commit 8707b7a15b.

related: #18660

Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/intro.txt

@@ -1,4 +1,4 @@
-*intro.txt*     For Vim version 9.1.  Last change: 2025 Nov 01
+*intro.txt*     For Vim version 9.1.  Last change: 2025 Oct 12
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -450,8 +450,6 @@ notation	meaning		    equivalent	decimal value(s)	~
 <Del>		delete				127
 <CSI>		command sequence intro  ALT-Esc 155	*<CSI>*
 <xCSI>		CSI when typed in the GUI		*<xCSI>*
-<OSC>		operating system command	157	*<OSC>*
-<xOSC>		finished OSC response			*<xOSC>*
 
 <EOL>		end-of-line (can be <CR>, <NL> or <CR><NL>,
 		depends on system and 'fileformat')	*<EOL>*

runtime/doc/tags

@@ -3841,7 +3841,6 @@ $quote	eval.txt	/*$quote*
 <NL>	motion.txt	/*<NL>*
 <Nop>	map.txt	/*<Nop>*
 <Nul>	intro.txt	/*<Nul>*
-<OSC>	intro.txt	/*<OSC>*
 <PageDown>	scroll.txt	/*<PageDown>*
 <PageUp>	scroll.txt	/*<PageUp>*
 <Plug>	map.txt	/*<Plug>*
@@ -3962,7 +3961,6 @@ $quote	eval.txt	/*$quote*
 <xHome>	term.txt	/*<xHome>*
 <xHome>-xterm	term.txt	/*<xHome>-xterm*
 <xLeft>	term.txt	/*<xLeft>*
-<xOSC>	intro.txt	/*<xOSC>*
 <xRight>	term.txt	/*<xRight>*
 <xUp>	term.txt	/*<xUp>*
 =	change.txt	/*=*

src/keymap.h

@@ -280,7 +280,6 @@ enum key_extra
     , KE_SID = 106		// <SID> special key, followed by {nr};
     , KE_ESC = 107		// used for K_ESC
     , KE_WILD = 108		// triggers wildmode completion
-    , KE_OSC = 109		// OSC sequence
 };
 
 /*
@@ -479,7 +478,6 @@ enum key_extra
 #define K_MOUSERIGHT	TERMCAP2KEY(KS_EXTRA, KE_MOUSERIGHT)
 
 #define K_CSI		TERMCAP2KEY(KS_EXTRA, KE_CSI)
-#define K_OSC		TERMCAP2KEY(KS_EXTRA, KE_OSC)
 #define K_SNR		TERMCAP2KEY(KS_EXTRA, KE_SNR)
 #define K_PLUG		TERMCAP2KEY(KS_EXTRA, KE_PLUG)
 #define K_CMDWIN	TERMCAP2KEY(KS_EXTRA, KE_CMDWIN)

src/misc2.c

@@ -1053,7 +1053,6 @@ static struct key_name_entry
     {TRUE, NL, STRING_INIT("NewLine"), TRUE},
     {TRUE, NL, STRING_INIT("NL"), FALSE},
     {TRUE, K_ZERO, STRING_INIT("Nul"), FALSE},
-    {TRUE, OSC, STRING_INIT("OSC"), FALSE},
     {TRUE, K_PAGEDOWN, STRING_INIT("PageDown"), FALSE},
     {TRUE, K_PAGEUP, STRING_INIT("PageUp"), FALSE},
     {TRUE, K_PE, STRING_INIT("PasteEnd"), FALSE},
@@ -1112,7 +1111,6 @@ static struct key_name_entry
     {TRUE, K_XF4, STRING_INIT("xF4"), FALSE},
     {TRUE, K_XHOME, STRING_INIT("xHome"), FALSE},
     {TRUE, K_XLEFT, STRING_INIT("xLeft"), FALSE},
-    {TRUE, K_OSC, STRING_INIT("xOSC"), FALSE},
     {TRUE, K_XRIGHT, STRING_INIT("xRight"), FALSE},
     {TRUE, K_XUP, STRING_INIT("xUp"), FALSE},
     {TRUE, K_ZEND, STRING_INIT("zEnd"), FALSE},

src/term.c

@@ -5933,6 +5933,7 @@ handle_osc(char_u *tp, int len, char_u *key_name, int *slen)
 	last_char = ((char_u *)osc_state.buf.ga_data)[osc_state.buf.ga_len - 1];
 
     key_name[0] = (int)KS_EXTRA;
+    key_name[1] = (int)KE_IGNORE;
 
     // Read data and append to buffer. If we reach a terminator, then
     // finally set the vim var.
@@ -5944,8 +5945,6 @@ handle_osc(char_u *tp, int len, char_u *key_name, int *slen)
 	{
 	    osc_state.processing = FALSE;
 
-	    key_name[1] = (int)KE_OSC;
-
 	    ga_concat_len(&osc_state.buf, tp, i + 1 + (tp[i] == ESC));
 	    ga_append(&osc_state.buf, NUL);
 	    *slen = i + 1 + (tp[i] == ESC);
@@ -5963,8 +5962,6 @@ handle_osc(char_u *tp, int len, char_u *key_name, int *slen)
 	    return OK;
 	}
 
-    key_name[1] = (int)KE_IGNORE;
-
 #ifdef ELAPSED_FUNC
     if (ELAPSED_FUNC(osc_state.start_tv) >= p_ost)
     {

src/version.c

@@ -729,6 +729,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1896,
 /**/
     1895,
 /**/