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use zero width space as dummy preedit to avoid text shift #170

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Jul 6, 2024
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4 changes: 3 additions & 1 deletion macosfrontend/macosfrontend.swift
Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,8 @@ import InputMethodKit
private var u16pos = 0
private var currentPreedit = ""

private let zeroWidthSpace = "\u{200B}"

private func commitString(_ client: IMKTextInput, _ string: String) {
client.insertText(string, replacementRange: NSRange(location: NSNotFound, length: NSNotFound))
}
Expand Down Expand Up @@ -42,7 +44,7 @@ public func commitAndSetPreeditSync(
// But when there is selected text, we don't want the dummy preedit to clear all of
// them. An example is using Shift+click to select but IM switch happens.
if preedit.isEmpty && dummyPreedit && client.selectedRange().length == 0 {
setPreedit(client, " ", 0)
setPreedit(client, zeroWidthSpace, 0)
} else {
setPreedit(client, preedit, cursorPos)
}
Expand Down