patch 9.0.0154: text properties wrong after splitting a line

Problem:    Text properties wrong after splitting a line.
Solution:   Check for text properties after the line. (closes #10857)

src/ops.c

@@ -1944,7 +1944,7 @@ skip_comment(
 }
 
 /*
- * Join 'count' lines (minimal 2) at cursor position.
+ * Join 'count' lines (minimal 2) at the cursor position.
  * When "save_undo" is TRUE save lines for undo first.
  * Set "use_formatoptions" to FALSE when e.g. processing backspace and comment
  * leaders should not be removed.

src/testdir/dumps/Test_prop_with_text_after_join_split_1.dump

@@ -0,0 +1,8 @@
+|1+0&#ffffff0@1| @57
+>2@1| @57
+| +0#ffffff16#e000002|B|e|l|o|w| |t|h|e| |l|i|n|e| | +0#0000000#ffffff0@43
+|~+0#4040ff13&| @58
+|~| @58
+|~| @58
+|~| @58
+| +0#0000000&@41|2|,|1| @10|A|l@1| 

src/testdir/dumps/Test_prop_with_text_after_join_split_2.dump

@@ -0,0 +1,8 @@
+|1+0&#ffffff0@1> |2@1| @54
+| +0#ffffff16#e000002|B|e|l|o|w| |t|h|e| |l|i|n|e| | +0#0000000#ffffff0@43
+|~+0#4040ff13&| @58
+|~| @58
+|~| @58
+|~| @58
+|~| @58
+| +0#0000000&@41|1|,|3| @10|A|l@1| 

src/testdir/dumps/Test_prop_with_text_after_join_split_3.dump

@@ -0,0 +1,8 @@
+|1+0&#ffffff0@1> |2@1| +0&#ffff4012|a|f|t|e|r| |t|h|e| |t|e|x|t| | +0&#ffffff0@27| +0&#ffff4012|r|i|g|h|t| |h|e|r|e
+| +0#ffffff16#e000002|B|e|l|o|w| |t|h|e| |l|i|n|e| | +0#0000000#ffffff0@43
+|~+0#4040ff13&| @58
+|~| @58
+|~| @58
+|~| @58
+|~| @58
+|:+0#0000000&|c|a|l@1| |A|d@1|M|o|r|e|(|)| @26|1|,|3| @10|A|l@1| 

src/testdir/dumps/Test_prop_with_text_after_join_split_4.dump

@@ -0,0 +1,8 @@
+|1+0&#ffffff0@1| @57
+>2@1| +0&#ffff4012|a|f|t|e|r| |t|h|e| |t|e|x|t| | +0&#ffffff0@30| +0&#ffff4012|r|i|g|h|t| |h|e|r|e
+| +0#ffffff16#e000002|B|e|l|o|w| |t|h|e| |l|i|n|e| | +0#0000000#ffffff0@43
+|~+0#4040ff13&| @58
+|~| @58
+|~| @58
+|~| @58
+| +0#0000000&@41|2|,|1| @10|A|l@1| 

src/testdir/dumps/Test_prop_with_text_after_join_split_5.dump

@@ -0,0 +1,8 @@
+|1+0&#ffffff0@1> |2@1| +0&#ffff4012|a|f|t|e|r| |t|h|e| |t|e|x|t| | +0&#ffffff0@27| +0&#ffff4012|r|i|g|h|t| |h|e|r|e
+| +0#ffffff16#e000002|B|e|l|o|w| |t|h|e| |l|i|n|e| | +0#0000000#ffffff0@43
+|~+0#4040ff13&| @58
+|~| @58
+|~| @58
+|~| @58
+|~| @58
+| +0#0000000&@41|1|,|3| @10|A|l@1| 

src/testdir/test_textprop.vim

@@ -2450,6 +2450,41 @@ func Test_props_with_text_after_nowrap()
   call delete('XscriptPropsAfterNowrap')
 endfunc
 
+func Test_props_with_text_after_split_join()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      call setline(1, ['1122'])
+      call prop_type_add('belowprop', #{highlight: 'ErrorMsg'})
+      call prop_add(1, 0, #{type: 'belowprop', text: ' Below the line ', text_align: 'below'})
+      exe "normal f2i\<CR>\<Esc>"
+
+      func AddMore()
+        call prop_type_add('another', #{highlight: 'Search'})
+        call prop_add(1, 0, #{type: 'another', text: ' after the text ', text_align: 'after'})
+        call prop_add(1, 0, #{type: 'another', text: ' right here', text_align: 'right'})
+      endfunc
+  END
+  call writefile(lines, 'XscriptPropsAfterSplitJoin')
+  let buf = RunVimInTerminal('-S XscriptPropsAfterSplitJoin', #{rows: 8, cols: 60})
+  call VerifyScreenDump(buf, 'Test_prop_with_text_after_join_split_1', {})
+
+  call term_sendkeys(buf, "ggJ")
+  call VerifyScreenDump(buf, 'Test_prop_with_text_after_join_split_2', {})
+
+  call term_sendkeys(buf, ":call AddMore()\<CR>")
+  call VerifyScreenDump(buf, 'Test_prop_with_text_after_join_split_3', {})
+
+  call term_sendkeys(buf, "ggf s\<CR>\<Esc>")
+  call VerifyScreenDump(buf, 'Test_prop_with_text_after_join_split_4', {})
+
+  call term_sendkeys(buf, "ggJ")
+  call VerifyScreenDump(buf, 'Test_prop_with_text_after_join_split_5', {})
+
+  call StopVimInTerminal(buf)
+  call delete('XscriptPropsAfterSplitJoin')
+endfunc
+
 func Test_removed_prop_with_text_cleans_up_array()
   new
   call setline(1, 'some text here')

src/textprop.c

@@ -621,6 +621,8 @@ prop_count_below(buf_T *buf, linenr_T lnum)
  * Return the number of text properties on line "lnum" in the current buffer.
  * When "only_starting" is true only text properties starting in this line will
  * be considered.
+ * When "last_line" is FALSE then text properties after the line are not
+ * counted.
  */
     int
 count_props(linenr_T lnum, int only_starting, int last_line)
@@ -634,7 +636,7 @@ count_props(linenr_T lnum, int only_starting, int last_line)
     for (i = 0; i < proplen; ++i)
     {
 	mch_memmove(&prop, props + i * sizeof(prop), sizeof(prop));
-	// A prop is droppend when in the first line and it continues from the
+	// A prop is dropped when in the first line and it continues from the
 	// previous line, or when not in the last line and it is virtual text
 	// after the line.
 	if ((only_starting && (prop.tp_flags & TP_FLAG_CONT_PREV))
@@ -706,7 +708,7 @@ set_text_props(linenr_T lnum, char_u *props, int len)
 }
 
 /*
- * Add "text_props" with "text_prop_count" text propertis to line "lnum".
+ * Add "text_props" with "text_prop_count" text properties to line "lnum".
  */
     void
 add_text_props(linenr_T lnum, textprop_T *text_props, int text_prop_count)
@@ -2031,8 +2033,9 @@ adjust_props_for_split(
 	pt = text_prop_type_by_id(curbuf, prop.tp_type);
 	start_incl = (pt != NULL && (pt->pt_flags & PT_FLAG_INS_START_INCL));
 	end_incl = (pt != NULL && (pt->pt_flags & PT_FLAG_INS_END_INCL));
-	cont_prev = prop.tp_col + !start_incl <= kept;
+	cont_prev = prop.tp_col != MAXCOL && prop.tp_col + !start_incl <= kept;
-	cont_next = skipped <= prop.tp_col + prop.tp_len - !end_incl;
+	cont_next = prop.tp_col != MAXCOL
+			   && skipped <= prop.tp_col + prop.tp_len - !end_incl;
 
 	if (cont_prev && ga_grow(&prevprop, 1) == OK)
 	{
@@ -2048,17 +2051,22 @@ adjust_props_for_split(
 
 	// Only add the property to the next line if the length is bigger than
 	// zero.
-	if (cont_next && ga_grow(&nextprop, 1) == OK)
+	if ((cont_next || prop.tp_col == MAXCOL)
+						&& ga_grow(&nextprop, 1) == OK)
 	{
 	    textprop_T *p = ((textprop_T *)nextprop.ga_data) + nextprop.ga_len;
+
 	    *p = prop;
 	    ++nextprop.ga_len;
-	    if (p->tp_col > skipped)
+	    if (p->tp_col != MAXCOL)
-		p->tp_col -= skipped - 1;
-	    else
 	    {
-		p->tp_len -= skipped - p->tp_col;
+		if (p->tp_col > skipped)
-		p->tp_col = 1;
+		    p->tp_col -= skipped - 1;
+		else
+		{
+		    p->tp_len -= skipped - p->tp_col;
+		    p->tp_col = 1;
+		}
 	    }
 	    if (cont_prev)
 		p->tp_flags |= TP_FLAG_CONT_PREV;

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    154,
 /**/
     153,
 /**/