patch 9.0.0705: virtual text truncation does not take padding into account

Problem:    Virtual text truncation does not take padding into account.
Solution:   Subtract the padding from the available space. (closes #11318)

src/drawline.c

@@ -573,6 +573,7 @@ textprop_size_after_trunc(
 	win_T	*wp,
 	int	flags,	    // TP_FLAG_ALIGN_*
 	int	added,
+	int	padding,
 	char_u	*text,
 	int	*n_used_ptr)
 {
@@ -585,6 +586,8 @@ textprop_size_after_trunc(
     // if the remaining size is to small wrap anyway and use the next line
     if (space < PROP_TEXT_MIN_CELLS)
 	space += wp->w_width;
+    if (flags & TP_FLAG_ALIGN_BELOW)
+	space -= padding;
     for (n_used = 0; n_used < len; n_used += (*mb_ptr2len)(text + n_used))
     {
 	int clen = ptr2cells(text + n_used);
@@ -629,7 +632,7 @@ text_prop_position(
     char_u  *l = NULL;
     int	    strsize = vim_strsize(*p_extra);
     int	    cells = wrap ? strsize : textprop_size_after_trunc(wp,
-				      tp->tp_flags, before, *p_extra, &n_used);
+			     tp->tp_flags, before, padding, *p_extra, &n_used);
 
     if (wrap || right || above || below || padding > 0 || n_used < *n_extra)
     {
@@ -715,7 +718,7 @@ text_prop_position(
 			// change last character to '…'
 			lp -= (*mb_head_off)(l, lp);
 			STRCPY(lp, "…");
-			n_used = lp - l + 3 - padding;
+			n_used = lp - l + 3 - before - padding;
 		    }
 		    else
 			// change last character to '>'

src/testdir/dumps/Test_long_text_with_padding_1.dump

@@ -0,0 +1,8 @@
+|f+0&#ffffff0|i|r|s|t| |l|i|n|e| @49
+@3|a+0&#ffd7ff255|f|t|e|r| |a|f|t|e|r| |a|f|t|e|r| |a|f|t|e|r| |a|f|t|e|r| |a|f|t|e|r| |a|f|t|e|r| |a|f|t|e|r| |a|f|t|e|r| |a|f|…
+| +0&#ffffff0@29|m+0&#ffd7ff255|o|r|e| |m|o|r|e| |m|o|r|e| |m|o|r|e| |m|o|r|e| |m|o|r|e|…
+|s+0&#ffffff0|e|c|o|n|d| >l|i|n|e| @48
+|~+0#4040ff13&| @58
+|~| @58
+|~| @58
+| +0#0000000&@41|2|,|8| @10|A|l@1| 

src/testdir/test_textprop.vim

@@ -3183,6 +3183,34 @@ func Test_insert_text_with_padding()
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_long_text_below_with_padding()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      vim9script
+      setline(1, ['first line', 'second line'])
+      prop_type_add('theprop', {highlight: 'DiffChange'})
+      prop_add(1, 0, {
+          type: 'theprop',
+          text: 'after '->repeat(20),
+          text_align: 'below',
+          text_padding_left: 3,
+      })
+      prop_add(1, 0, {
+          type: 'theprop',
+          text: 'more '->repeat(20),
+          text_align: 'below',
+          text_padding_left: 30,
+      })
+      normal 2Gw
+  END
+  call writefile(lines, 'XlongTextBelowWithPadding', 'D')
+  let buf = RunVimInTerminal('-S XlongTextBelowWithPadding', #{rows: 8, cols: 60})
+  call VerifyScreenDump(buf, 'Test_long_text_with_padding_1', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_insert_text_change_arg()
   CheckRunVimInTerminal
 

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    705,
 /**/
     704,
 /**/