st-flexipatch

commit b82057eb85be26d83d5dcb7e8f3b74a95166cca5
parent 677f854c05e04e38b77d4659578f64c4a67c347b
Author: Bakkeby <bakkeby@gmail.com>
Date:   Sun, 25 Jun 2023 14:19:27 +0200

Fix for wide character being incorrectly cleared on MODE_INSERT

Under insert mode, when inserting a normal character in front of
a wide character, the affected region is shifted to the right by
one cell. However, the empty cell is reset as if being a part of a
wide character, causing the following cell being mishandled as a
dummy cell.
To reproduce the bug:
	printf '\033[4h' # set MODE_INSERT
	printf 妳好
	printf '\033[4D'
	printf 'x'
	printf '\033[4l\n'

Ref.
https://git.suckless.org/st/commit/3a6d6d740110e6ee1b092d05ad746244eedabe4b.html

Diffstat:
M
README.md
 | 
2
+-
M
st.c
 | 
4
+++-

2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.9 (211964d, 2023-02-07) project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more.
+Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.9 (3a6d6d7, 2023-06-25) project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more.
 
 For example to include the `alpha` patch then you would only need to flip this setting from 0 to 1 in [patches.h](https://github.com/bakkeby/st-flexipatch/blob/master/patches.def.h):
 ```c
diff --git a/st.c b/st.c
@@ -3244,8 +3244,10 @@ check_control_code:
 		gp = &term.line[term.c.y][term.c.x];
 	}
 
-	if (IS_SET(MODE_INSERT) && term.c.x+width < term.col)
+	if (IS_SET(MODE_INSERT) && term.c.x+width < term.col) {
 		memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
+		gp->mode &= ~ATTR_WIDE;
+	}
 
 	if (term.c.x+width > term.col) {
 		tnewline(1);