Fix scale startup issues on MacOS

[akleshchev]

UI scale sometimes starts as massive on macOS, which is not visible in logs. What is also missing from logs is handleResize, so I assume that is the cause of the bug. Making viewDidMoveToWindow mark size as dirty even if size didn't change.

Snippet:

2026-08-28T16:59:27Z DEBUG #Window# newview/llviewerwindow.cpp(2046) LLViewerWindow : Display init: screen_size=3026x1794 system_ui_size=2 pixel_aspect_ratio=1 saved_UIScaleFactor=1.125 ResetUIScaleOnFirstRun=0
2026-08-28T16:59:27Z DEBUG #Window# newview/llviewerwindow.cpp(2061) LLViewerWindow : Display scale computed: ui_scale_factor=2.25 mDisplayScale={ 2.25, 2.25 } (clamped_to=[0.75, 7])2026-08-28T16:59:27Z DEBUG 2026-08-28T16:59:27Z DEBUG #Window# newview/llviewerwindow.cpp(2095) LLViewerWindow : Loading feature tables.
2026-08-28T16:59:29Z INFO #InitInfo# newview/llappviewer.cpp(1009) init : Window is initialized.
2026-08-28T16:59:29Z DEBUG #Window# newview/llviewerdisplay.cpp(176) display_startup : First display_startup frame
2026-08-28T16:59:29Z DEBUG #Window# newview/llviewerdisplay.cpp(176) display_startup : First display_startup frame
2026-08-28T16:59:29Z INFO #AppInit# newview/llstartup.cpp(3263) setStartupState : STATE_BROWSER_INIT --> STATE_LOGIN_SHOW
2026-08-28T16:59:29Z INFO #AppInit# newview/llstartup.cpp(2652) login_show : Initializing Login Screen

[Copilot]

Pull request overview

This PR aims to fix macOS startup UI scaling issues by ensuring the viewer marks its resolution/scale state as “dirty” even when the view attaches to a window without an immediate size change, making the eventual reshape/scale computation happen reliably.

Changes:

• Add a new window callback (handleRequestResolutionUpdate) and a macOS bridge (callRequestResolutionUpdate) to request a deferred resolution/scale update.
• Update macOS viewDidMoveToWindow to request a resolution update when the backing size doesn’t appear to change immediately.
• Adjust LLViewerWindow::checkSettings() to reshape using the live window size queried from mWindow->getSize().

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
indra/newview/llviewerwindow.h	Declares the new handleRequestResolutionUpdate callback on LLViewerWindow.
indra/newview/llviewerwindow.cpp	Implements the callback and uses live mWindow->getSize() during deferred reshapes.
indra/llwindow/llwindowcallbacks.h	Extends the window callback interface with handleRequestResolutionUpdate.
indra/llwindow/llwindowcallbacks.cpp	Adds a default no-op implementation for the new callback.
indra/llwindow/llwindowmacosx-objc.h	Exposes callRequestResolutionUpdate() to ObjC/ObjC++ code.
indra/llwindow/llwindowmacosx.cpp	Implements callRequestResolutionUpdate() to forward into callbacks.
indra/llwindow/llopenglview-objc.mm	Triggers callRequestResolutionUpdate() from viewDidMoveToWindow when appropriate.

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[akleshchev]

QA confirmed that this works.