patch 9.0.1199: crash when using kitty and using a mapping with <Esc>
Problem: Crash when using kitty and using a mapping with <Esc>.
Solution: Do not try setting did_simplify when it is NULL. (closes #11817)
diff --git a/src/vim.h b/src/vim.h
index 655935f..7d58b06 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2818,6 +2818,7 @@
#define FSK_KEEP_X_KEY 0x02 // don't translate xHome to Home key
#define FSK_IN_STRING 0x04 // TRUE in string, double quote is escaped
#define FSK_SIMPLIFY 0x08 // simplify <C-H> and <A-x>
+#define FSK_FROM_PART 0x10 // left-hand-side of mapping
// Flags for the readdirex function, how to sort the result
#define READDIR_SORT_NONE 0 // do not sort