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QT can't be made to draw monospaced text (if the font does not cooperate), so avoid combining characters, using a QPainter::drawText() call for each character. For bidi text support this change requires konsole to reorder and reshape the characters. This is done using the ICU library (which QT also uses). This change allows for some improvements related to text rendering: - More precise bidi reordering, which is no longer changed by characters' attributes and selection. - underlines drawn separately from the text, allowing for differing underline modes (double, curly, dashed, dotted, colored). - Overriding font for emoji characters. This commit fixes a few bugs and addresses a lot more: Feature requests: More standard conforming RTL and various underlines: BUG: 403729 BUG: 387811 Using non-monospace font: BUG: 416508 BUG: 452087 BUG: 425973 BUG: 430822 BUG: 442742 BUG: 441037 BUG: 430822 Emoji: BUG: 440070 CCBUG: 450017 CCBUG: 445846 CCBUG: 453086 Regression: devanagari rendering CCBUG: 381593 CCBUG: 451716
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