use "emoji" as fallback font to prevent crash when emoji is not found

This reverts commit 042af42400.

README.md

@@ -1,4 +1,4 @@
-Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.9.3 (6e97047, 2025-08-09) 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 0.9.3 (688f70a, 2026-01-15) 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

config.def.h

@@ -8,7 +8,7 @@
 static char *font = "Cascadia Code NF:regular:pixelsize=13.5:fontfeatures=calt,ss01:antialias=true:autohint=true";
 #if FONT2_PATCH
 /* Spare fonts */
-static char *font2[] = { "CaskaydiaCove Nerd Font:pixelsize=13.5:antialias=true:autohint=true" };
+static char *font2[] = { "emoji:pixelsize=13.5:antialias=true:autohint=true" };
 #endif // FONT2_PATCH
 
 #if BACKGROUND_IMAGE_PATCH

flake.nix

@@ -51,6 +51,7 @@
 
         devShell = pkgs.mkShell {
           inputsFrom = [ packages.st ];
+          hardeningDisable = [ "fortify" ];
           packages = with pkgs; [
             bear
             clang-tools

st.c

@@ -1102,6 +1102,9 @@ tsetdirt(int top, int bot)
 {
 	int i;
 
+	if (term.row <= 0)
+		return;
+
 	LIMIT(top, 0, term.row-1);
 	LIMIT(bot, 0, term.row-1);
 
@@ -3332,6 +3335,7 @@ eschandle(uchar ascii)
 		resettitle();
 		xloadcols();
 		xsetmode(0, MODE_HIDE);
+		xsetmode(0, MODE_BRCKTPASTE);
 		#if SCROLLBACK_PATCH && !REFLOW_PATCH
 		if (!IS_SET(MODE_ALTSCREEN)) {
 			term.scr = 0;
@@ -3466,6 +3470,11 @@ check_control_code:
 			return;
 		#if SIXEL_PATCH
 		} else if (term.esc & ESC_DCS) {
+			/* Skip if DCS escape sequence buffer is full */
+			if (csiescseq.len >= sizeof(csiescseq.buf) - 1) {
+				return;
+			}
+
 			csiescseq.buf[csiescseq.len++] = u;
 			if (BETWEEN(u, 0x40, 0x7E)
 					|| csiescseq.len >= \