From bb3259fd727ae751abb33364e91d73ab1bcda4da Mon Sep 17 00:00:00 2001
From: Mateus Auler <mateusauler@protonmail.com>
Date: Sun, 19 Jul 2020 18:03:58 -0300
Subject: [PATCH] Fixed issue where when moving a client to a different
 monitor, it would incorrectly check the client's previous monitor instead of
 its current one to determine if the gaps and border should be drawn.

---
 config.def.h |  1 +
 dwm.c        | 36 ++++++++++++++++++++++++++++++------
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/config.def.h b/config.def.h
index 1c0b587..b11471d 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 */
diff --git a/dwm.c b/dwm.c
index 9fd0286..79703b3 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);
-- 
2.27.0