feat(hyprdrive,hyprlua): trap pointer to focused window in monocle (super+ctrl+f)

Monocle now also confines the cursor to the focused full-size window so it
can't slip onto another monitor. Hyprland has no cursor-confine dispatcher, so
this drives the confine_pointer window rule: one lazily-created rule per
workspace, matched by workspace id (follows focus), enabled/disabled in
lock-step with the monocle toggle and refreshed immediately.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

desktopenvs/hyprdrive/hypr/usr/binds.lua

@@ -107,11 +107,36 @@ hl.bind(mainMod .. " + CTRL + M",        hl.dsp.exec_cmd("~/.config/scripts/togg
 -- Switch the focused window's workspace to the "monocle" layout (one full-size window
 -- at a time), toggling back to the session default (columns) on a second press.
 -- Uses the same layouts registry the astro-menu popup drives via `hyprctl eval`.
+--
+-- Monocle also traps the pointer to the focused window. Hyprland has no cursor-confine
+-- dispatcher, but the `confine_pointer` window rule pins the pointer to whichever window
+-- is focused on a matched workspace, so the trap follows focus as you cycle the single
+-- full-size window and the cursor can't slip onto another monitor. We keep one rule per
+-- workspace, created lazily and enabled/disabled in lock-step with the monocle toggle.
+local confine_rules = {}   -- wid(str) -> HL.WindowRule
+local function set_pointer_trap(wid, on)
+    local rule = confine_rules[wid]
+    if not rule then
+        local okr, r = pcall(hl.window_rule, {
+            name  = "monocle-confine-" .. wid,
+            match = { workspace = wid },
+            confine_pointer = true,
+            enabled = false,
+        })
+        if not okr then return end
+        rule, confine_rules[wid] = r, r
+    end
+    rule:set_enabled(on)
+    -- apply to the already-focused window now, instead of on the next window event
+    if hl.exec_scheduled_prop_refresh_immediately then hl.exec_scheduled_prop_refresh_immediately() end
+end
 local function toggle_monocle()
     local ok, aw = pcall(hl.get_active_window)
     if not ok or not aw or not aw.workspace then return end
     local wid = tostring(aw.workspace.id)
-    layouts.set(wid, layouts.current[wid] == "monocle" and "columns" or "monocle")
+    local to_monocle = layouts.current[wid] ~= "monocle"
+    layouts.set(wid, to_monocle and "monocle" or "columns")
+    set_pointer_trap(wid, to_monocle)
 end
 hl.bind(mainMod .. " + CTRL + F", toggle_monocle)
 

desktopenvs/hyprlua/hypr/usr/binds.lua

@@ -111,11 +111,36 @@ hl.bind(mainMod .. " + CTRL + M",        hl.dsp.exec_cmd("~/.config/scripts/togg
 -- Switch the focused window's workspace to the "monocle" layout (one full-size window
 -- at a time), toggling back to the session default (columns) on a second press.
 -- Uses the same layouts registry the astal-menu popup drives via `hyprctl eval`.
+--
+-- Monocle also traps the pointer to the focused window. Hyprland has no cursor-confine
+-- dispatcher, but the `confine_pointer` window rule pins the pointer to whichever window
+-- is focused on a matched workspace, so the trap follows focus as you cycle the single
+-- full-size window and the cursor can't slip onto another monitor. We keep one rule per
+-- workspace, created lazily and enabled/disabled in lock-step with the monocle toggle.
+local confine_rules = {}   -- wid(str) -> HL.WindowRule
+local function set_pointer_trap(wid, on)
+    local rule = confine_rules[wid]
+    if not rule then
+        local okr, r = pcall(hl.window_rule, {
+            name  = "monocle-confine-" .. wid,
+            match = { workspace = wid },
+            confine_pointer = true,
+            enabled = false,
+        })
+        if not okr then return end
+        rule, confine_rules[wid] = r, r
+    end
+    rule:set_enabled(on)
+    -- apply to the already-focused window now, instead of on the next window event
+    if hl.exec_scheduled_prop_refresh_immediately then hl.exec_scheduled_prop_refresh_immediately() end
+end
 local function toggle_monocle()
     local ok, aw = pcall(hl.get_active_window)
     if not ok or not aw or not aw.workspace then return end
     local wid = tostring(aw.workspace.id)
-    layouts.set(wid, layouts.current[wid] == "monocle" and "columns" or "monocle")
+    local to_monocle = layouts.current[wid] ~= "monocle"
+    layouts.set(wid, to_monocle and "monocle" or "columns")
+    set_pointer_trap(wid, to_monocle)
 end
 hl.bind(mainMod .. " + CTRL + F", toggle_monocle)