vim-patch:8.2.0956: spell test fails

Problem:    Spell test fails.
Solution:   Add missing change the spell checking.
https://github.com/vim/vim/commit/e0ebeda4d8219a8955001b43ef7a9268452ef7f5

1 files changed, 23 insertions, 1 deletions

diff --git a/src/nvim/spell.c b/src/nvim/spell.c
index dc1bfe25b4..f036d7fe04 100644
--- a/src/nvim/spell.c
+++ b/src/nvim/spell.c
@@ -362,6 +362,8 @@ size_t spell_check(
   size_t wrongcaplen = 0;
   int lpi;
   bool count_word = docount;
+  bool use_camel_case = *wp->w_s->b_p_spo != NUL;
+  bool camel_case = false;
 
   // A word never starts at a space or a control character. Return quickly
   // then, skipping over the character.
@@ -394,9 +396,24 @@ size_t spell_check(
   mi.mi_word = ptr;
   mi.mi_fend = ptr;
   if (spell_iswordp(mi.mi_fend, wp)) {
+    int prev_upper;
+    int this_upper;
+
+    if (use_camel_case) {
+      c = PTR2CHAR(mi.mi_fend);
+      this_upper = SPELL_ISUPPER(c);
+    }
+
     do {
       MB_PTR_ADV(mi.mi_fend);
-    } while (*mi.mi_fend != NUL && spell_iswordp(mi.mi_fend, wp));
+      if (use_camel_case) {
+        prev_upper = this_upper;
+        c = PTR2CHAR(mi.mi_fend);
+        this_upper = SPELL_ISUPPER(c);
+        camel_case = !prev_upper && this_upper;
+      }
+    } while (*mi.mi_fend != NUL && spell_iswordp(mi.mi_fend, wp)
+             && !camel_case);
 
     if (capcol != NULL && *capcol == 0 && wp->w_s->b_cap_prog != NULL) {
       // Check word starting with capital letter.
@@ -428,6 +445,11 @@ size_t spell_check(
   (void)spell_casefold(ptr, (int)(mi.mi_fend - ptr), mi.mi_fword, MAXWLEN + 1);
   mi.mi_fwordlen = (int)STRLEN(mi.mi_fword);
 
+  if (camel_case) {
+    // introduce a fake word end space into the folded word.
+    mi.mi_fword[mi.mi_fwordlen - 1] = ' ';
+  }
+
   // The word is bad unless we recognize it.
   mi.mi_result = SP_BAD;
   mi.mi_result2 = SP_BAD;