vim-patch:9.0.0130: cursor position wrong when inserting around virtual text

Problem:    Cursor position wrong when inserting around virtual text.
Solution:   Update the cursor position properly.

1f4ee19eef

Co-authored-by: tom-anders <13141438+tom-anders@users.noreply.github.com>

src/nvim/buffer_defs.h

@@ -808,6 +808,7 @@ struct file_buffer {
 
   MarkTree b_marktree[1];
   Map(uint32_t, uint32_t) b_extmark_ns[1];         // extmark namespaces
+  size_t b_virt_text_inline;                       // number of inline virtual texts
   size_t b_virt_line_blocks;    // number of virt_line blocks
   size_t b_signs;               // number of sign extmarks
   size_t b_signs_with_text;     // number of sign extmarks with text

src/nvim/decoration.c

@@ -95,6 +95,10 @@ void decor_remove(buf_T *buf, int row, int row2, Decoration *decor)
 {
   decor_redraw(buf, row, row2, decor);
   if (decor) {
+    if (kv_size(decor->virt_text) && decor->virt_text_pos == kVTInline) {
+      assert(buf->b_virt_text_inline > 0);
+      buf->b_virt_text_inline--;
+    }
     if (kv_size(decor->virt_lines)) {
       assert(buf->b_virt_line_blocks > 0);
       buf->b_virt_line_blocks--;

src/nvim/edit.c

@@ -232,7 +232,7 @@ static void insert_enter(InsertState *s)
   stop_insert_mode = false;
 
   // need to position cursor again when on a TAB
-  if (gchar_cursor() == TAB) {
+  if (gchar_cursor() == TAB || curbuf->b_virt_text_inline > 0) {
     curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL);
   }
 
@@ -3471,7 +3471,7 @@ static bool ins_esc(long *count, int cmdchar, bool nomove)
   State = MODE_NORMAL;
   may_trigger_modechanged();
   // need to position cursor again when on a TAB
-  if (gchar_cursor() == TAB) {
+  if (gchar_cursor() == TAB || curbuf->b_virt_text_inline > 0) {
     curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL);
   }
 

src/nvim/extmark.c

@@ -148,6 +148,9 @@ revised:
   }
 
   if (decor) {
+    if (kv_size(decor->virt_text) && decor->virt_text_pos == kVTInline) {
+      buf->b_virt_text_inline++;
+    }
     if (kv_size(decor->virt_lines)) {
       buf->b_virt_line_blocks++;
     }