patch 8.1.0681: text properties as not adjusted for deleted text

Problem:    Text properties as not adjusted for deleted text.
Solution:   Adjust text properties when backspacing to delete text.

src/edit.c

@@ -6737,7 +6737,6 @@ internal_format(
 			 * comment leader for the numbered list.  */
 			for (i = 0; i < padding; i++)
 			    ins_str((char_u *)" ");
-			changed_bytes(curwin->w_cursor.lnum, leader_len);
 		    }
 		    else
 		    {

src/misc1.c

@@ -2749,7 +2749,7 @@ del_bytes(
 #endif
 
     // mark the buffer as changed and prepare for displaying
-    changed_bytes(lnum, curwin->w_cursor.col);
+    inserted_bytes(lnum, curwin->w_cursor.col, -count);
 
     return OK;
 }

src/testdir/dumps/Test_textprop_01.dump

@@ -1,6 +1,6 @@
 | +0#af5f00255#ffffff0@1|1| |O+0#0000000&|n|e| +0&#ffff4012|t|w|o| +0&#ffffff0@63
 | +0#af5f00255&@1|2| |N+0#0000000#ffff4012|u|m|b|é|r| |1+0#4040ff13&|2|3| +0#0000000&|ä|n|d| |t|h|œ|n| |4+0#4040ff13&|¾|7|.+0#0000000&| +0&#ffffff0@46
-| +0#af5f00255&@1|3| |-+0#0000000#ffff4012@1|x+0&#ffffff0|a+0#4040ff13&@1|x+0#0000000&|-@1|x+0#4040ff13&|b@1|x+0#0000000&|-@1|x|c+0#4040ff13&@1|x|-+0#0000000&@1|x+0#4040ff13&|d@1>x|-+0#0000000&@1| @44
+| +0#af5f00255&@1|3| >-+0#0000000#ffff4012|x+0&#ffffff0|a+0#4040ff13&@1|x+0#0000000&|-@1|x+0#4040ff13&|b@1|x+0#0000000&|-@1|x|c+0#4040ff13&@1|x|-+0#0000000&@1|x+0#4040ff13&|d@1|x|-+0#0000000&@1| @45
 |~+0#4040ff13&| @73
 |~| @73
-| +0#0000000&@56|3|,|2|4| @9|A|l@1| 
+| +0#0000000&@56|3|,|1| @10|A|l@1| 

src/testdir/test_textprop.vim

@@ -177,6 +177,29 @@ func Test_prop_add_remove_buf()
   bwipe!
 endfunc
 
+func Test_prop_backspace()
+  new
+  set bs=2
+  call setline(1, 'xonex xtwoxx')
+  call AddPropTypes()
+  call prop_add(1, 2, {'length': 3, 'id': 11, 'type': 'one'})
+  call prop_add(1, 8, {'length': 3, 'id': 12, 'type': 'two'})
+  let expected = [
+	\ {'col': 2, 'length': 3, 'id': 11, 'type': 'one', 'start': 1, 'end': 1},
+	\ {'col': 8, 'length': 3, 'id': 12, 'type': 'two', 'start': 1, 'end': 1},
+	\]
+  call assert_equal(expected, prop_list(1))
+
+  exe "normal 0li\<BS>\<Esc>fxli\<BS>\<Esc>"
+  call assert_equal('one xtwoxx', getline(1))
+  let expected[0].col = 1
+  let expected[1].col = 6
+  call assert_equal(expected, prop_list(1))
+
+  call DeletePropTypes()
+  bwipe!
+  set bs&
+endfunc
 
 func Test_prop_clear()
   new
@@ -319,6 +342,7 @@ funct Test_textprop_screenshots()
 	\ "hi clear SpellBad",
 	\ "set spell",
 	\ "normal 3G0llix\<Esc>lllix\<Esc>lllix\<Esc>lllix\<Esc>lllix\<Esc>lllix\<Esc>lllix\<Esc>lllix\<Esc>",
+	\ "normal 3G0lli\<BS>\<Esc>",
 	\], 'XtestProp')
   let buf = RunVimInTerminal('-S XtestProp', {'rows': 6})
   call VerifyScreenDump(buf, 'Test_textprop_01', {})

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    681,
 /**/
     680,
 /**/