Diff for git://git.suckless.org/dwm to make "useless gap" work on 6.0. Works only in the `tile` function.

tilegap.patch

diff --git a/config.def.h b/config.def.h
index 8fd5d4a..82b010e 100644
--- a/config.def.h
+++ b/config.def.h
@@ -10,6 +10,7 @@ static const char selbgcolor[]      = "#005577";
 static const char selfgcolor[]      = "#eeeeee";
 static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
+static const unsigned int tilespace = 6;        /* spacing between tiles */
 static const Bool showbar           = True;     /* False means no bar */
 static const Bool topbar            = True;     /* False means bottom bar */
 
diff --git a/dwm.c b/dwm.c
index 7941bd1..e56b21e 100644
--- a/dwm.c
+++ b/dwm.c
@@ -1712,26 +1712,42 @@ textnw(const char *text, unsigned int len) {
 
 void
 tile(Monitor *m) {
-	unsigned int i, n, h, mw, my, ty;
+	unsigned int i, n, h, mw, my, ty, ts, ys, xs;
 	Client *c;
 
 	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
 	if(n == 0)
 		return;
 
-	if(n > m->nmaster)
+	if(n > m->nmaster) {
 		mw = m->nmaster ? m->ww * m->mfact : 0;
-	else
+        ts = m->nmaster ? tilespace * 1.5 : tilespace * 2;
+
+    } else {
 		mw = m->ww;
-	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
+        ts = tilespace * 2;
+    }
+
+	for(i = my = ty = ys = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
 		if(i < m->nmaster) {
-			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
-			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
+			h = (m->wh - my - (MIN(n, m->nmaster) + 1) * tilespace) / (MIN(n, m->nmaster) - i) ;
+            ys = i * tilespace;
+			resize(c, m->wx + tilespace, m->wy + my + tilespace + ys,
+                    mw - (2*c->bw) - ts, h - (2*c->bw), False);
 			my += HEIGHT(c);
 		}
 		else {
-			h = (m->wh - ty) / (n - i);
-			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
+            // m->nmaster > 1  yshift on tiles by nmaster * tilespace
+			h = (m->wh - ty - (n - m->nmaster + 1) * tilespace) / (n - i);
+            ys = (i-m->nmaster) * tilespace;
+            if(m->nmaster > 0) {
+                xs = 0.5 * tilespace;
+            } else {
+                xs = tilespace;
+                ys += tilespace;
+            }
+			resize(c, m->wx + mw + xs, m->wy + ty + tilespace + ys,
+                    m->ww - mw - (2*c->bw) - ts, h - (2*c->bw), False);
 			ty += HEIGHT(c);
 		}
 }