[mfkeeq199458]

F11 now detaches the active log window into its own top-level window and hides the main window; F11 or ESC returns to the normal mode. The float window gets min/max buttons, a resizable border, a taskbar button, its own stable icon and a maximizable double-click-title behaviour; dark title bars are re-applied after the style-driven handle recreation.

TabController gains GetPlacedWindows/GetNextWindow/GetPreviousWindow and a guarded CloseAllExcept; the View menu offers the toggle as "Log Only View" (en/de/zh-CN) with F11 as a display-only shortcut hint. DetachMode service, message filter and a NativeWindow caption hook live in DetachModeService; 17 controller tests plus 6 filter tests cover it.

[Hirogen]

Thanks @mfkeeq199458 — a focus mode for a single log is a nice idea, and it's good that F11 doesn't clash with anything and that closing the app while detached leaves the saved main-window layout intact. Before this can go in, there are a few behavioural issues, plus some housekeeping.

ESC handling (blocking)
The filter catches ESC for the whole app, and the text-input guard doesn't work as intended:

• Form.ActiveForm?.ActiveControl is TextBoxBase (DetachMessageFilter.cs:31) stops at the nearest nested container, so it sees the LogWindow, not the filter/search box or the in-grid edit control. ESC in those inputs therefore leaves detach mode instead of doing its normal job. A check like GetFocus() → Control.FromHandle(...) is TextBoxBase (or walking the ContainerControl chain) would find the real focused control.
• ESC on the grid normally cancels a search and clears highlighting (LogWindow.cs:6989). The filter's own comment says that should keep working, but while detached it exits the mode instead.
• If a modal dialog is open (e.g. from the float window), ESC is swallowed: the dialog stays open and the main window reappears behind it. Please only react when the active form is the detached float window.

The ESC tests stub _isTextInputFocused, so they can't catch this. It needs a manual check, or a test that exercises the real focus lookup.

Restoring state on exit

• Exit docks the window again with Show(_dockPanel, DockState.Document) (DetachModeController.cs:107), so the original tab position and any split pane are lost. Please restore the original pane and index.
• If the window was already floating before F11, Exit leaves the patched chrome on it (no owner, taskbar button, sizable border). ReleaseFloatWindow only removes the hook.
• _detachModeController is never disposed in LogTabWindow.Dispose, and the message filter is only removed when Exit() runs. Please make the controller IDisposable and dispose it next to _tabController.

Scope

• "Close other tabs" now goes through CloseAllExcept and asks for confirmation, where before it closed directly. That's a user-visible change detach mode doesn't need. Please split it into its own PR (or drop it).
• Ctrl+Tab cycling, "opening a file replaces the detached window" and "X on the float detaches the next hidden window" are reasonable, but they aren't in the description. Please document them. I'd also argue the X button should simply return to the main window; that's what most users will expect.

Housekeeping

• The PR adds 10 new analyzer warnings (CA1060, CA5392, CA1051, CA1303, CA1001, CA1031). Please get the build back to the base warning count.
• LogExpert.UI already uses Vanara: please use Vanara.PInvoke.User32 for GetWindowLongPtr / CallWindowProc, and put DwmSetWindowAttribute in NativeMethods (or use Vanara.DwmApi) instead of new DllImports.
• WM_KEYDOWN and the autorepeat bit are defined in both the filter and LogTabWindow. The restore-dock-state block is repeated three times in the controller. Please extract both.
• ToggleDetachMode() only calls Enter(). Please rename it, or make it actually toggle.
• Comments: we keep them minimal in this repo. DetachModeController is about 20% comments, many of them multi-paragraph. Please trim them to the non-obvious "why" lines.
• Naming: the code says "detach mode", the UI says "Log Only View". Please pick one concept name and use it throughout.
• Test seams: prefer constructor injection over mutable internal fields.
• The new blocks in LogTabWindow.designer.cs look hand-edited (// without the trailing space). Please let the designer generate them.

Description

• The title says "Replace compact mode", but there's no compact mode on Development. Please retitle to something like "Add F11 Log Only View".
• The test count is off: the code has 9 controller + 8 filter + 6 TabController tests.

Thanks — the core idea is solid. ESC handling and restoring the original state on exit are the two I need fixed; the rest is cleanup.