https://bugs.documentfoundation.org/show_bug.cgi?id=167562
Bug ID: 167562
Summary: Summary: "Automatic" font color in Calc fails to
provide sufficient contrast for wrapped text in dark
mode, appearing dark on dark, while unwrapped text
correctly appears light on dark.
Product: LibreOffice
Version: 25.2.4.3 release
Hardware: x86-64 (AMD64)
OS: Windows (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Calc
Assignee: [email protected]
Reporter: [email protected]
Created attachment 201864
--> https://bugs.documentfoundation.org/attachment.cgi?id=201864&action=edit
Font color automatic setting in dark mode
When LibreOffice Calc is configured with a dark application background (either
via System theme following OS dark mode, or explicitly set in Application
Colors), the "Automatic" font color setting behaves inconsistently.
For short sentences or text that does not wrap within a cell, the "Automatic"
font color correctly renders as a light color (e.g., white) against the dark
cell background, ensuring good readability on screen.
However, for long sentences or text that does wrap within the same cell (with
"Wrap text automatically" enabled), the "Automatic" font color incorrectly
renders as a dark color (e.g., black or dark grey) against the dark cell
background. This makes the wrapped text unreadable on screen.
This issue forces users to manually set the font color to white for
readability, which then causes a printing problem (white text on white paper
becomes invisible). The "Automatic" font color should ideally adapt for both
screen display (dark background -> light font) and printing (white paper ->
dark font). The current behavior for wrapped text breaks this expected
functionality.
Steps to Reproduce:
Ensure your LibreOffice UI is set to a dark theme:
Go to Tools > Options > LibreOffice > View.
Set "Mode" to "Dark" (or "System" if your Windows 10 OS is already in Dark
Mode).
Ensure your Calc document background is dark:
Go to Tools > Options > LibreOffice > Application Colors.
Under "Color scheme," set "Document background" to a dark color (e.g., "Black"
or "Dark Grey 3").
Ensure "Font color" is set to "Automatic".
Click "OK" and restart LibreOffice Calc if prompted.
Open a new or existing Calc spreadsheet.
In a cell (e.g., A1), type a short sentence that does not require wrapping
(e.g., "Short text"). Observe its font color.
In another cell (e.g., A2), type a very long sentence that will definitely
require wrapping (e.g., "This is a very long sentence that will extend beyond
the current column width and force the text to wrap automatically within the
cell, demonstrating the issue clearly.").
Ensure "Wrap text automatically" is enabled for cell A2:
Select cell A2.
Go to Format > Cells... > Alignment tab.
Check the box for "Wrap text automatically."
Adjust the column width of A2 so that the text wraps onto multiple lines.
Actual Results:
The short sentence in A1 (unwrapped) correctly displays with a light font color
(e.g., white) on the dark background.
The long sentence in A2 (wrapped) incorrectly displays with a dark font color
(e.g., black or dark grey) on the dark background, making it unreadable on
screen.
Expected Results:
Both unwrapped and wrapped text with "Automatic" font color should display with
a light font color (e.g., white) on a dark screen background to ensure
readability.
The "Automatic" font color should correctly switch to a dark color (e.g.,
black) when the document is printed on a white background.
Additional Information:
UI render: Skia/Raster
VCL: win
Locale: en-MY (en_MY); UI: en-GB
Calc: threaded
This issue forces a workaround of manually setting font color to white for
wrapped text, which then creates a problem for printing (invisible text on
white paper).
A sample .ods file demonstrating the issue would be helpful to attach to the
bug report.
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