patch 8.1.2057: the screen.c file is much too big
Problem: The screen.c file is much too big.
Solution: Split it in three parts. (Yegappan Lakshmanan, closes #4943)
diff --git a/src/vim.h b/src/vim.h
index 8bfbcaf..bd25165 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -587,6 +587,13 @@
#define NOT_VALID 40 // buffer needs complete redraw
#define CLEAR 50 // screen messed up, clear it
+// flags for screen_line()
+#define SLF_RIGHTLEFT 1
+#define SLF_POPUP 2
+
+#define MB_FILLER_CHAR '<' // character used when a double-width character
+ // doesn't fit.
+
/*
* Flags for w_valid.
* These are set when something in a window structure becomes invalid, except