[Repo Assist] fix: apply colour temperature when enabling all-monitors mode

[github-actions]

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Problem

When the user has set a non-default colour temperature (warm or cool tint) and then enables Show on All Monitors, the new per-monitor overlay windows are created with hardcoded neutral white/grey gradient stops — they ignore the current _colorTemperature value.

Repro steps:

1. Set colour temperature to warm (K- several times)
2. Right-click tray → Show on All Monitors
3. Expected: all monitors show the warm glow
4. Actual: additional monitors show the default neutral-white glow

Same issue applies to brightness: the gradient opacity is set correctly at creation time via path.Opacity = currentOpacity, but the colour isn't.

Closes #85

Root Cause

CreateMonitorWindow initialises the LinearGradientBrush with hardcoded values and ShowOnAllMonitors never syncs the current UI state to the newly created windows. The existing UpdateAdditionalMonitorWindows() helper already handles syncing opacity, colour temperature and on/off state to all additional windows — it just wasn't called after the creation loop.

Fix

Added a single UpdateAdditionalMonitorWindows() call at the end of ShowOnAllMonitors(), after all new windows are added and shown. This ensures every new window immediately reflects the current colour temperature, brightness, and on/off state.

Trade-offs

None — the change is a single method call on objects that already exist. The helper iterates the same list that was just populated, so no redundant work occurs.

Test Status

✅ Build: dotnet build -p:EnableWindowsTargeting=true — succeeded with 0 errors, 0 warnings.

⚠️ Runtime tests: Requires Windows. Manual testing recommended:

1. Set colour temperature to warm (K- key or tray menu several times)
2. Enable Show on All Monitors
3. All monitors should show the warm tint immediately

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Show patch (39 lines)

From 72ad794c9fb7c330325cdee40b97aa9c8aa51f1c Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Thu, 2 Jul 2026 01:33:03 +0000
Subject: [PATCH] fix: apply colour temperature when enabling all-monitors mode

When ShowOnAllMonitors() creates new per-monitor windows the gradient
is initialised with hardcoded neutral white/grey stops, ignoring
whatever colour temperature the user had set. The existing
UpdateAdditionalMonitorWindows() helper already knows how to sync
opacity, colour temperature and on/off state to the additional windows;
it just wasn't being called after the windows were created.

Closes #85

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 WindowsEdgeLight/MainWindow.xaml.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/WindowsEdgeLight/MainWindow.xaml.cs b/WindowsEdgeLight/MainWindow.xaml.cs
index c24a3c7..c0fd21c 100644
--- a/WindowsEdgeLight/MainWindow.xaml.cs
+++ b/WindowsEdgeLight/MainWindow.xaml.cs
@@ -971,6 +971,11 @@ Version {version}";
                 monitorCtx.Window.Show();
             }
         }
+
+        // Sync current brightness, colour temperature, and on/off state to all new windows.
+        // CreateMonitorWindow initialises the gradient with neutral colours; this call
+        // applies whatever the user currently has set so every monitor matches.
+        UpdateAdditionalMonitorWindows();
     }
 
     private void HideAdditionalMonitorWindows()
-- 
2.54.0