There may be another approach for fix this.
Since OpenJDK BasicLookAndFeel.java set text background color to fixed 'white'
color,
it causes the issue.
https://github.com/openjdk/jdk/blob/fb8ceae0a77fecb0b14de5bd00253e074b0aba90/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicLookAndFeel.java#L1657-L1678
"TextPane.font", serifPlain12,
"TextPane.background", white,
"TextPane.foreground", textText,
"TextPane.selectionBackground", textHighlight,
"TextPane.selectionForeground", textHighlightText,
"TextPane.caretForeground", textText,
"TextPane.caretBlinkRate", caretBlinkRate,
"TextPane.inactiveForeground", textInactiveText,
"TextPane.border", marginBorder,
"TextPane.margin", editorMargin,
"EditorPane.font", serifPlain12,
"EditorPane.background", white,
"EditorPane.foreground", textText,
"EditorPane.selectionBackground", textHighlight,
"EditorPane.selectionForeground", textHighlightText,
"EditorPane.caretForeground", textText,
"EditorPane.caretBlinkRate", caretBlinkRate,
"EditorPane.inactiveForeground", textInactiveText,
"EditorPane.border", marginBorder,
"EditorPane.margin", editorMargin,
One idea is that we can change 'TextPane.background' to 'text' instead of
'white'.
It would make side effects around all default LaFs other than Aqua.
My proposed patch is a quick hack only to effect against GTKLaF.
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https://bugs.launchpad.net/bugs/1894419
Title:
Missing TextPane.background property in GTKLookAndFeel causes white
background on dark theme
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