patch 9.0.0918: MS-Windows: modifier keys do not work with mouse scroll event Commit: https://github.com/vim/vim/commit/0319306f20d2a5989d1f5639a47d77cebeac2f29 Author: Christopher Plewright <chris@createng.com> Date: Tue Nov 22 12:58:27 2022 +0000 patch 9.0.0918: MS-Windows: modifier keys do not work with mouse scroll event Problem: MS-Windows: modifier keys do not work with mouse scroll events. Solution: Use K_SPECIAL instead of CSI for the modifier keys. (Christopher Plewright, closes #11587)

--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -2047,7 +2047,8 @@ mch_inchar(
 	    {
 		if (modifiers > 0)
 		{
-		    typeahead[typeaheadlen++] = CSI;
+		    // use K_SPECIAL instead of CSI to make mappings work
+		    typeahead[typeaheadlen++] = K_SPECIAL;
 		    typeahead[typeaheadlen++] = KS_MODIFIER;
 		    typeahead[typeaheadlen++] = modifiers;
 		}