https://bugs.documentfoundation.org/show_bug.cgi?id=172399
Bug ID: 172399
Summary: macOS Tahoe 26.5.1 Apple M1 Pro: Window contents
jitter during resize with Skia/Metal in 26.2.4.2 but
not 25.8.7.3
Product: LibreOffice
Version: 26.2.4.2 release
Hardware: ARM
OS: macOS (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Calc
Assignee: [email protected]
Reporter: [email protected]
Description:
LibreOffice 26.2.4.2 on macOS Tahoe 26.5.1 exhibits severe window redraw jitter
while resizing Calc windows.
The issue occurs with both existing spreadsheets and completely blank
spreadsheets.
The problem disappears immediately after downgrading to LibreOffice 25.8.7.3 on
the same machine.
The primary difference observed is the rendering engine:
26.2.4.2:
UI render: Skia/Metal
VCL: osx
25.8.7.3:
UI render: default
VCL: osx
This appears related to the mandatory Skia/Metal rendering path in LibreOffice
26.2.
Steps to Reproduce:
1.Install LibreOffice 26.2.4.2 (AARCH64).
2.Open Calc.
3.Create a new blank spreadsheet.
4.Resize the application window continuously using the mouse.
Actual Results:
Document contents visibly jitter/shake during window resizing.
CPU utilization increases significantly (approximately 100%+ observed in
Activity Monitor).
The behavior occurs consistently and is reproducible every time.
Expected Results:
Window contents should redraw smoothly during resizing without jitter or
excessive CPU usage.
Reproducible: Always
User Profile Reset: Yes
Additional Info:
Hardware:
MacBook Pro 16-inch (2021)
Apple M1 Pro
16 GB RAM
Operating System:
macOS Tahoe 26.5.1
LibreOffice 26.2.4.2 (AARCH64):
UI render: Skia/Metal
VCL: osx
LibreOffice 25.8.7.3 (AARCH64):
UI render: default
VCL: osx
The issue occurs even in a completely blank spreadsheet and is not dependent on
document content.
Downgrading from 26.2.4.2 to 25.8.7.3 resolves the issue immediately.
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