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.
diff --git a/src/testdir/dumps/Test_textprop_01.dump b/src/testdir/dumps/Test_textprop_01.dump
index 98130a7..8687a0a 100644
--- a/src/testdir/dumps/Test_textprop_01.dump
+++ b/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|