From b538dd545a5cef8931fe076089d3edc7b3daaa3b Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@hey.com>
Date: Tue, 4 Aug 2026 13:42:38 -0500
Subject: [PATCH] Persist integer GDK_SCALE when monitor scale is fractional

GTK only honors whole-number GDK_SCALE values, so persisting 1.6 or 1.25
verbatim left GTK apps without a usable scale. Round to the nearest whole
factor when writing monitors.lua.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 bin/omarchy-hyprland-monitor-scaling |  7 +++++--
 test/shell.d/monitor-scaling-test.sh | 16 ++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/bin/omarchy-hyprland-monitor-scaling b/bin/omarchy-hyprland-monitor-scaling
index 24060ecc..240a1ea5 100755
--- a/bin/omarchy-hyprland-monitor-scaling
+++ b/bin/omarchy-hyprland-monitor-scaling
@@ -81,6 +81,9 @@ set_scale() {
   local height="$(echo "$monitor_info" | jq -r '.height')"
   local refresh_rate="$(echo "$monitor_info" | jq -r '.refreshRate')"
   local new_scale="$(clean_scale "$requested_scale" "$width" "$height")"
+  # GTK only honors integer GDK_SCALE values, so persist the nearest whole
+  # factor even when the monitor scale itself is fractional.
+  local new_gdk_scale="$(awk -v scale="$new_scale" 'BEGIN { printf "%d", int(scale + 0.5) }')"
   local monitor_lua="$HOME/.config/hypr/monitors.lua"
 
   hyprctl eval "hl.monitor({ output = \"$active_monitor\", mode = \"${width}x${height}@${refresh_rate}\", position = \"auto\", scale = $new_scale })" >/dev/null
@@ -91,12 +94,12 @@ set_scale() {
   if [[ -f $monitor_lua ]] && grep -q '^local omarchy_monitor_scale = ' "$monitor_lua"; then
     sed -i -E \
       -e "s|^local omarchy_monitor_scale = .*|local omarchy_monitor_scale = ${new_scale}|" \
-      -e "s|^local omarchy_gdk_scale = .*|local omarchy_gdk_scale = ${new_scale}|" \
+      -e "s|^local omarchy_gdk_scale = .*|local omarchy_gdk_scale = ${new_gdk_scale}|" \
       "$monitor_lua"
   elif [[ -f $monitor_lua ]] && grep -Eq '^hl\.monitor\(\{ output = "", mode = "preferred", position = "auto", scale = ("auto"|[0-9.]+) \}\)' "$monitor_lua"; then
     sed -i -E \
       -e "s|^(hl\.monitor\(\{ output = \"\", mode = \"preferred\", position = \"auto\", scale = )([^ ]+)( \}\))|\\1${new_scale}\\3|" \
-      -e 's|^hl\.env\("GDK_SCALE", ".*"\)|hl.env("GDK_SCALE", "'"$new_scale"'")|' \
+      -e 's|^hl\.env\("GDK_SCALE", ".*"\)|hl.env("GDK_SCALE", "'"$new_gdk_scale"'")|' \
       "$monitor_lua"
   fi
 }
diff --git a/test/shell.d/monitor-scaling-test.sh b/test/shell.d/monitor-scaling-test.sh
index 4a0519cf..96f81171 100644
--- a/test/shell.d/monitor-scaling-test.sh
+++ b/test/shell.d/monitor-scaling-test.sh
@@ -68,8 +68,24 @@ write_monitor_config
 OMARCHY_TEST_MONITOR_SCALE=2 run_scaling 3
 grep -F 'scale = 3' "$eval_out" >/dev/null || fail "monitor scaling explicit 3x remains available"
 grep -Fx 'local omarchy_monitor_scale = 3' "$monitor_lua" >/dev/null || fail "monitor scaling explicit 3x persists"
+grep -Fx 'local omarchy_gdk_scale = 3' "$monitor_lua" >/dev/null || fail "monitor scaling explicit 3x persists GDK scale"
 pass "monitor scaling explicit 3x remains available"
 
+# GTK only honors integer GDK_SCALE, so fractional monitor scales persist a
+# rounded GDK scale.
+write_monitor_config
+OMARCHY_TEST_MONITOR_SCALE=2 run_scaling 1.6
+grep -F 'scale = 1.6' "$eval_out" >/dev/null || fail "monitor scaling explicit 1.6x remains available"
+grep -Fx 'local omarchy_monitor_scale = 1.6' "$monitor_lua" >/dev/null || fail "monitor scaling explicit 1.6x persists"
+grep -Fx 'local omarchy_gdk_scale = 2' "$monitor_lua" >/dev/null || fail "monitor scaling 1.6x persists integer GDK scale 2"
+pass "monitor scaling 1.6x persists integer GDK scale 2"
+
+write_monitor_config
+OMARCHY_TEST_MONITOR_SCALE=2 run_scaling 1.25
+grep -Fx 'local omarchy_monitor_scale = 1.25' "$monitor_lua" >/dev/null || fail "monitor scaling explicit 1.25x persists"
+grep -Fx 'local omarchy_gdk_scale = 1' "$monitor_lua" >/dev/null || fail "monitor scaling 1.25x persists integer GDK scale 1"
+pass "monitor scaling 1.25x persists integer GDK scale 1"
+
 scale=$(OMARCHY_TEST_MONITOR_SCALE=3 run_scaling)
 [[ $scale == "3" ]] || fail "monitor scaling reports explicit 3x scale" "actual: $scale"
 pass "monitor scaling reports explicit 3x scale"