Understood, thank you for the clarification. I submitted it here because I consider this a functional bug in vanilla dwm (internal state becoming inconsistent with physical geometry during tagmon), rather than a new feature or customization.
Regards, On Mon, Mar 9, 2026 at 10:41 AM Hiltjo Posthuma <hiltjo@codemadnessorg> wrote: > > Please use the wiki (sites repository) for patches else it becomes confusing. > > Mailinglists: > @hackers is for upstream patches. > @dev is for more general development discussion, ideas and non-upstream > patches etc. > See: https://suckless.org/community/ > > Thank you, > > On Mon, Mar 09, 2026 at 02:31:23AM +0200, Ruben Gonzalez wrote: > > When a fullscreen window is moved to another monitor (e.g. via > > tagmon), its geometry does not always match the new monitor's > > dimensions. > > > > Steps to reproduce: > > 1. Start dwm with two monitors (A and B). > > 2. Open a window on Monitor A. > > 3. Make the window fullscreen (e.g. Firefox with F11). > > 4. Move the window to Monitor B using the tagmon shortcut (Mod+Shift+>). > > 5. Go to the other monitor (B), observe that the window is still > > visible on Monitor A and its contents, even though the window's title > > is seen on Monitor B bar. > > 6. Go to the monitor A where the window is still in fullscreen, remove > > the fullscreen and the window automatically will go to monitor B. > > > > This fix ensures that fullscreen windows are correctly resized to the > > new monitor's geometry during the move. > > > > 0001-sendmon-resize-fullscreen-windows-to-target-monitor.patch > > > > From 0bcf8e03402b657a6bb93bb662e72bf299f45bbb Mon Sep 17 00:00:00 2001 > > From: Ruben Gonzalez <[email protected]> > > Date: Sun, 8 Mar 2026 11:24:40 +0200 > > Subject: [dwm][PATCH] sendmon: resize fullscreen windows to target monitor > > > > --- > > dwm.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/dwm.c b/dwm.c > > index 0a67103..6fe226f 100644 > > --- a/dwm.c > > +++ b/dwm.c > > @@ -1429,6 +1429,8 @@ sendmon(Client *c, Monitor *m) > > c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */ > > attach(c); > > attachstack(c); > > + if (c->isfullscreen) > > + resizeclient(c, m->mx, m->my, m->mw, m->mh); > > focus(NULL); > > arrange(NULL); > > } > > -- > > > > -- > Kind regards, > Hiltjo >
