patch 9.0.1731: blockwise Visual highlight not working with virtual text

Problem: blockwise Visual highlight not working with virtual text
Solution: Reset the correct variable at the end of virtual selection and
          Check for double-width char inside virtual text.

closes: #12606

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
diff --git a/src/testdir/dumps/Test_prop_inserts_text_visual_block_1.dump b/src/testdir/dumps/Test_prop_inserts_text_visual_block_1.dump
new file mode 100644
index 0000000..ce82e39
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_inserts_text_visual_block_1.dump
@@ -0,0 +1,6 @@
+>1+0&#ffffff0|2|3|4|5|6|7|8|9| @50
+|1|-+0#e000e06&|口*&|-+&|2+0#0000000&|3|4|5|6|7|8|9| @46
+|1|2|3|4|5|6|7|8|9| @50
+|~+0#4040ff13&| @58
+|~| @58
+| +0#0000000&@41|1|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_prop_inserts_text_visual_block_2.dump b/src/testdir/dumps/Test_prop_inserts_text_visual_block_2.dump
new file mode 100644
index 0000000..4fe696a
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_inserts_text_visual_block_2.dump
@@ -0,0 +1,6 @@
+|1+0&#e0e0e08|2|3+0&#ffffff0|4|5|6|7|8|9| @50
+|1+0&#e0e0e08|-+0#e000e06#ffffff0|口*&|-+&|2+0#0000000&|3|4|5|6|7|8|9| @46
+|1+0&#e0e0e08>2+0&#ffffff0|3|4|5|6|7|8|9| @50
+|~+0#4040ff13&| @58
+|~| @58
+|-+2#0000000&@1| |V|I|S|U|A|L| |B|L|O|C|K| |-@1| +0&&@13|3|x|2| @6|3|,|2| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_prop_inserts_text_visual_block_3.dump b/src/testdir/dumps/Test_prop_inserts_text_visual_block_3.dump
new file mode 100644
index 0000000..27820c1
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_inserts_text_visual_block_3.dump
@@ -0,0 +1,6 @@
+|1+0&#e0e0e08|2|3|4+0&#ffffff0|5|6|7|8|9| @50
+|1+0&#e0e0e08|-+0#e000e06#ffffff0|口*&|-+&|2+0#0000000&|3|4|5|6|7|8|9| @46
+|1+0&#e0e0e08|2>3+0&#ffffff0|4|5|6|7|8|9| @50
+|~+0#4040ff13&| @58
+|~| @58
+|-+2#0000000&@1| |V|I|S|U|A|L| |B|L|O|C|K| |-@1| +0&&@13|3|x|3| @6|3|,|3| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_prop_inserts_text_visual_block_4.dump b/src/testdir/dumps/Test_prop_inserts_text_visual_block_4.dump
new file mode 100644
index 0000000..8db2dd2
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_inserts_text_visual_block_4.dump
@@ -0,0 +1,6 @@
+|1+0&#e0e0e08|2|3|4|5|6|7|8+0&#ffffff0|9| @50
+|1+0&#e0e0e08|-+0#e000e06#ffffff0|口*&|-+&|2+0#0000000#e0e0e08|3|4+0&#ffffff0|5|6|7|8|9| @46
+|1+0&#e0e0e08|2|3|4|5|6>7+0&#ffffff0|8|9| @50
+|~+0#4040ff13&| @58
+|~| @58
+|-+2#0000000&@1| |V|I|S|U|A|L| |B|L|O|C|K| |-@1| +0&&@13|3|x|7| @6|3|,|7| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_prop_inserts_text_visual_block_5.dump b/src/testdir/dumps/Test_prop_inserts_text_visual_block_5.dump
new file mode 100644
index 0000000..92418cc
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_inserts_text_visual_block_5.dump
@@ -0,0 +1,6 @@
+|1+0&#ffffff0|2+0&#e0e0e08|3|4|5|6|7|8+0&#ffffff0|9| @50
+|1|-+0#e000e06&|口*&|-+&|2+0#0000000#e0e0e08|3|4+0&#ffffff0|5|6|7|8|9| @46
+|1>2|3+0&#e0e0e08|4|5|6|7|8+0&#ffffff0|9| @50
+|~+0#4040ff13&| @58
+|~| @58
+|-+2#0000000&@1| |V|I|S|U|A|L| |B|L|O|C|K| |-@1| +0&&@13|3|x|6| @6|3|,|2| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_prop_inserts_text_visual_block_6.dump b/src/testdir/dumps/Test_prop_inserts_text_visual_block_6.dump
new file mode 100644
index 0000000..78ba81d
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_inserts_text_visual_block_6.dump
@@ -0,0 +1,6 @@
+|1+0&#ffffff0|2|3+0&#e0e0e08|4|5|6|7|8+0&#ffffff0|9| @50
+|1|-+0#e000e06&|口*&|-+&|2+0#0000000#e0e0e08|3|4+0&#ffffff0|5|6|7|8|9| @46
+|1|2>3|4+0&#e0e0e08|5|6|7|8+0&#ffffff0|9| @50
+|~+0#4040ff13&| @58
+|~| @58
+|-+2#0000000&@1| |V|I|S|U|A|L| |B|L|O|C|K| |-@1| +0&&@13|3|x|5| @6|3|,|3| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_prop_inserts_text_visual_block_7.dump b/src/testdir/dumps/Test_prop_inserts_text_visual_block_7.dump
new file mode 100644
index 0000000..7011db7
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_inserts_text_visual_block_7.dump
@@ -0,0 +1,6 @@
+|1+0&#ffffff0|2|3|4+0&#e0e0e08|5|6|7|8+0&#ffffff0|9| @50
+|1|-+0#e000e06&|口*&|-+&|2+0#0000000#e0e0e08|3|4+0&#ffffff0|5|6|7|8|9| @46
+|1|2|3>4|5+0&#e0e0e08|6|7|8+0&#ffffff0|9| @50
+|~+0#4040ff13&| @58
+|~| @58
+|-+2#0000000&@1| |V|I|S|U|A|L| |B|L|O|C|K| |-@1| +0&&@13|3|x|4| @6|3|,|4| @10|A|l@1| 
diff --git a/src/testdir/test_textprop.vim b/src/testdir/test_textprop.vim
index 67547f0..d3a061d 100644
--- a/src/testdir/test_textprop.vim
+++ b/src/testdir/test_textprop.vim
@@ -2602,6 +2602,33 @@
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_prop_inserts_text_visual_block()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+    call setline(1, repeat(['123456789'], 3))
+    call prop_type_add('theprop', #{highlight: 'Special'})
+    call prop_add(2, 2, {'type': 'theprop', 'text': '-口-'})
+  END
+  call writefile(lines, 'XscriptPropsVisualBlock', 'D')
+  let buf = RunVimInTerminal('-S XscriptPropsVisualBlock', #{rows: 6, cols: 60})
+  call VerifyScreenDump(buf, 'Test_prop_inserts_text_visual_block_1', {})
+  call term_sendkeys(buf, "\<C-V>2jl")
+  call VerifyScreenDump(buf, 'Test_prop_inserts_text_visual_block_2', {})
+  call term_sendkeys(buf, "l")
+  call VerifyScreenDump(buf, 'Test_prop_inserts_text_visual_block_3', {})
+  call term_sendkeys(buf, "4l")
+  call VerifyScreenDump(buf, 'Test_prop_inserts_text_visual_block_4', {})
+  call term_sendkeys(buf, "Ol")
+  call VerifyScreenDump(buf, 'Test_prop_inserts_text_visual_block_5', {})
+  call term_sendkeys(buf, "l")
+  call VerifyScreenDump(buf, 'Test_prop_inserts_text_visual_block_6', {})
+  call term_sendkeys(buf, "l")
+  call VerifyScreenDump(buf, 'Test_prop_inserts_text_visual_block_7', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_prop_add_with_text_fails()
   call prop_type_add('failing', #{highlight: 'ErrorMsg'})
   call assert_fails("call prop_add(1, 0, #{type: 'failing', text: 'X', end_lnum: 1})", 'E1305:')