Add gaps between dwm windows via patch

.config/dwm/config.def.h

@@ -33,6 +33,7 @@
 
 /* The border pixel determines the size of the window border. */
 static const unsigned int borderpx = 15; /* border pixel of windows */
+static const unsigned int gappx     = 15;        /* gaps between windows */
 /* The snap pixel controls two things:
  *    - how close to the window area border a window must be before it "snaps"
  * (or docks) against that border when moving a floating window using the mouse
@@ -155,7 +156,7 @@ static const int nmaster = 1; /* number of clients in master area */
  * of a client window when the client is tiled. Refer to the applysizehints
  * function writeup for more details. */
 static const int resizehints =
-    1; /* 1 means respect size hints in tiled resizals */
+    0; /* 1 means respect size hints in tiled resizals */
 /* The lockfullscreen variable controls whether or not focus is allowed to drift
  * from a fullscreen window. Refer to the writeup of the focusstack function for
  * which this feature is isolated. */

.config/dwm/dwm.c

@@ -518,10 +518,10 @@
 #define MOUSEMASK (BUTTONMASK | PointerMotionMask)
 /* The actual width of a client window includes the border and this macro helps
  * calculate that. */
-#define WIDTH(X) ((X)->w + 2 * (X)->bw)
+#define WIDTH(X) ((X)->w + 2 * (X)->bw + gappx)
 /* The actual height of a client window includes the border and this macro helps
  * calculate that. */
-#define HEIGHT(X) ((X)->h + 2 * (X)->bw)
+#define HEIGHT(X) ((X)->h + 2 * (X)->bw + gappx)
 /* The TAGMASK macro gives a binary value that represents a valid bitmask
  * according to how many tags are defined.
  *
@@ -4578,6 +4578,29 @@ void resize(Client *c, int x, int y, int w, int h, int interact) {
  */
 void resizeclient(Client *c, int x, int y, int w, int h) {
   XWindowChanges wc;
+	unsigned int n;
+	unsigned int gapoffset;
+	unsigned int gapincr;
+	Client *nbc;
+  wc.border_width = c->bw;
+
+	/* Get number of clients for the client's monitor */
+	for (n = 0, nbc = nexttiled(c->mon->clients); nbc; nbc = nexttiled(nbc->next), n++);
+
+	/* Do nothing if layout is floating */
+	if (c->isfloating || c->mon->lt[c->mon->sellt]->arrange == NULL) {
+		gapincr = gapoffset = 0;
+	} else {
+		/* Remove border and gap if layout is monocle or only one client */
+		if (c->mon->lt[c->mon->sellt]->arrange == monocle || n == 1) {
+			gapoffset = 0;
+			gapincr = -2 * borderpx;
+			wc.border_width = 0;
+		} else {
+			gapoffset = gappx;
+			gapincr = 2 * gappx;
+		}
+	}
 
   /* There are three things happening here:
    *    - the existing x, y, w and h are stored in oldx, oldy, oldw and oldh
@@ -4590,15 +4613,10 @@ void resizeclient(Client *c, int x, int y, int w, int h) {
    * function, so setting those here is only in relation to the resizeclient
    * call being made in that function.
    */
-  c->oldx = c->x;
-  c->x = wc.x = x;
-  c->oldy = c->y;
-  c->y = wc.y = y;
-  c->oldw = c->w;
-  c->w = wc.width = w;
-  c->oldh = c->h;
-  c->h = wc.height = h;
-  wc.border_width = c->bw;
+	c->oldx = c->x; c->x = wc.x = x + gapoffset;
+	c->oldy = c->y; c->y = wc.y = y + gapoffset;
+	c->oldw = c->w; c->w = wc.width = w - gapincr;
+	c->oldh = c->h; c->h = wc.height = h - gapincr;
   /* This calls reconfigures the window's size, position and border according to
    * the XWindowChanges structure that have been populated with data above. */
   XConfigureWindow(
@@ -6188,7 +6206,7 @@ void tile(Monitor *m) {
        * client, we subtract the border width from the size 0              -
        * this resize is not the result of the user interacting with the window
        */
-      resize(c, m->wx, m->wy + my, mw - (2 * c->bw), h - (2 * c->bw), 0);
+      resize(c, m->wx, m->wy + my, mw - (2*c->bw) + (n > 1 ? gappx : 0), h - (2*c->bw), 0);
 
       /* We increment the master y position with the height of the client after
        * the resize so that we know where the next client can be positioned.

.config/dwm/patches/dwm-uselessgap-20211119-58414bee958f2.diff

@@ -0,0 +1,100 @@
+From 58414bee958f2e7ed91d6fe31f503ec4a406981b Mon Sep 17 00:00:00 2001
+From: cirala <thim@cederlund.de>
+Date: Fri, 19 Nov 2021 18:14:07 +0100
+Subject: [PATCH] Fix for dwm-uselessgap
+Previous versions of the patch doubles the
+gap between the master and slave stacks.
+
+---
+ config.def.h |  3 ++-
+ dwm.c        | 38 +++++++++++++++++++++++++++++++-------
+ 2 files changed, 33 insertions(+), 8 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index a2ac963..17a205f 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -2,6 +2,7 @@
+
+ /* appearance */
+ static const unsigned int borderpx  = 1;        /* border pixel of windows */
++static const unsigned int gappx     = 6;        /* gaps between windows */
+ static const unsigned int snap      = 32;       /* snap pixel */
+ static const int showbar            = 1;        /* 0 means no bar */
+ static const int topbar             = 1;        /* 0 means bottom bar */
+@@ -34,7 +35,7 @@ static const Rule rules[] = {
+ /* layout(s) */
+ static const float mfact     = 0.55; /* factor of master area size [0.05..0.95] */
+ static const int nmaster     = 1;    /* number of clients in master area */
+-static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */
++static const int resizehints = 0;    /* 1 means respect size hints in tiled resizals */
+ static const int lockfullscreen = 1; /* 1 will force focus on the fullscreen window */
+
+ static const Layout layouts[] = {
+diff --git a/dwm.c b/dwm.c
+index 5e4d494..b626e89 100644
+--- a/dwm.c
++++ b/dwm.c
+@@ -52,8 +52,8 @@
+ #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
+ #define LENGTH(X)               (sizeof X / sizeof X[0])
+ #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
+-#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
+-#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
++#define WIDTH(X)                ((X)->w + 2 * (X)->bw + gappx)
++#define HEIGHT(X)               ((X)->h + 2 * (X)->bw + gappx)
+ #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
+ #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
+
+@@ -1277,12 +1277,36 @@ void
+ resizeclient(Client *c, int x, int y, int w, int h)
+ {
+ 	XWindowChanges wc;
++	unsigned int n;
++	unsigned int gapoffset;
++	unsigned int gapincr;
++	Client *nbc;
+
+-	c->oldx = c->x; c->x = wc.x = x;
+-	c->oldy = c->y; c->y = wc.y = y;
+-	c->oldw = c->w; c->w = wc.width = w;
+-	c->oldh = c->h; c->h = wc.height = h;
+ 	wc.border_width = c->bw;
++
++	/* Get number of clients for the client's monitor */
++	for (n = 0, nbc = nexttiled(c->mon->clients); nbc; nbc = nexttiled(nbc->next), n++);
++
++	/* Do nothing if layout is floating */
++	if (c->isfloating || c->mon->lt[c->mon->sellt]->arrange == NULL) {
++		gapincr = gapoffset = 0;
++	} else {
++		/* Remove border and gap if layout is monocle or only one client */
++		if (c->mon->lt[c->mon->sellt]->arrange == monocle || n == 1) {
++			gapoffset = 0;
++			gapincr = -2 * borderpx;
++			wc.border_width = 0;
++		} else {
++			gapoffset = gappx;
++			gapincr = 2 * gappx;
++		}
++	}
++
++	c->oldx = c->x; c->x = wc.x = x + gapoffset;
++	c->oldy = c->y; c->y = wc.y = y + gapoffset;
++	c->oldw = c->w; c->w = wc.width = w - gapincr;
++	c->oldh = c->h; c->h = wc.height = h - gapincr;
++
+ 	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
+ 	configure(c);
+ 	XSync(dpy, False);
+@@ -1688,7 +1712,7 @@ tile(Monitor *m)
+ 	for (i = my = ty = 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), 0);
++			resize(c, m->wx, m->wy + my, mw - (2*c->bw) + (n > 1 ? gappx : 0), h - (2*c->bw), 0);
+ 			if (my + HEIGHT(c) < m->wh)
+ 				my += HEIGHT(c);
+ 		} else {
+--
+2.33.1