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When rendering the IME composing text, I noticed that for the Korean input sequence: shift+'ㅅ' followed by 'ㅏ' we'd render the 'ㅆ' (the shifted first character) in black and the composing 'ㅏ' in white against the cursor color, and that was very difficult to read, especially at the default font size. To resolve this, this commit: * Forces clustering to break around the cursor boundary, so that we treat the cursor position as its own separately styled cluster * Adjusts cursor/bg rendering so that we always consider the start of the cluster for the colors of that run. We are guaranteed that a ligatured sequence will fit in the background area anyway. This has the effect of "breaking" programming ligatures such as '->' when cursoring through them, and decomposing them into their individual '-' and '>' glyphs, which is a reasonable price to pay for being able to see things better on screen. refs: https://github.com/wez/wezterm/issues/1504 refs: https://github.com/wez/wezterm/issues/478 |
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