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

[github-actions]

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Problem

When the user enables "Show on All Monitors" mode, ShowOnAllMonitors() creates a new window for each secondary display using CreateMonitorWindow(). Those windows are initialised with a hardcoded neutral-white gradient, completely ignoring the colour temperature (and brightness) the user had already set.

Reproducer: set a warm colour temperature, then click "Toggle All Monitors" — secondary monitor windows appear with plain white light instead of the warm amber tint shown on the primary monitor.

Root Cause

ShowOnAllMonitors() never called UpdateAdditionalMonitorWindows() after adding the new contexts to additionalMonitorWindows. That call is what pushes the current _colorTemperature and currentOpacity values into each secondary window's brush and visibility state.

Fix

Add a single call to UpdateAdditionalMonitorWindows() at the end of ShowOnAllMonitors():

// Apply current colour temperature and brightness to the newly created windows
UpdateAdditionalMonitorWindows();

Trade-offs

• No behaviour change for users on a single monitor.
• The call iterates over the newly added windows and sets their gradient stops — negligible cost at startup.

Test Status

Step	Result
dotnet build -p:EnableWindowsTargeting=true	✅ 0 errors, 0 warnings

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Show patch (41 lines)

From aa3ae48fd4854be947557b18c0b0e3aa13c6f5b2 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Fri, 26 Jun 2026 01:36:28 +0000
Subject: [PATCH] fix: apply current colour temperature when enabling
 all-monitors mode
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When ShowOnAllMonitors() creates windows for additional monitors it
used a hardcoded neutral-white gradient, ignoring the colour temperature
the user had already dialled in. The fix calls UpdateAdditionalMonitorWindows()
immediately after all windows are shown so they inherit the current
opacity and colour temperature from the start.

Reproducer: set a warm colour temperature, then toggle
'Show on All Monitors' — secondary monitor windows now match.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 WindowsEdgeLight/MainWindow.xaml.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/WindowsEdgeLight/MainWindow.xaml.cs b/WindowsEdgeLight/MainWindow.xaml.cs
index c24a3c7..87a3824 100644
--- a/WindowsEdgeLight/MainWindow.xaml.cs
+++ b/WindowsEdgeLight/MainWindow.xaml.cs
@@ -971,6 +971,9 @@ Version {version}";
                 monitorCtx.Window.Show();
             }
         }
+
+        // Apply current colour temperature and brightness to the newly created windows
+        UpdateAdditionalMonitorWindows();
     }
 
     private void HideAdditionalMonitorWindows()
-- 
2.54.0

[shanselman]

Automated triage note from Copilot, acting on Scott's behalf.

This duplicates the newer all-monitors color-temperature issue #105. Closing the older bot duplicate.