Accent keys makes cursor jump backwards in Safari

v6
1

A wrong behaviour on Safari is observed when entering characters like ˜, ˆ after a highlighted character. The behaviour can be reproduced with a basic setup:

  1. Put the cursor at the end of line 2 (make sure the bracket(s) are highlighted)
  2. Press ⌥ + n on Mac
    The same process applies for line 5 with ⌥ + i

The cursor jumps backwards. After that, it sometimes produces unexpected behaviours on any future actions.

The wrong behaviour is observed only when entering accent characters directly from a keyboard but not when pasting them. Tested on Safari 16.2 (18614.3.7.1.5).

editor

2

Somehow, on my Safari (15.6.1, on macOS 16.6) this problem does not occur. The keys do start a composition (underlined, can combine with another char typed after) but the cursor stays in the right place and everything seems to work properly.

3

The keyboard source matters, and the new example supports both English (US) and English (GB).

rec2

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4

That just shows the same text twice, how is the example text keyboard-language related?

5

That just shows the same text twice

Both texts are similar (e.g. ˜ entered with US, ~ entered with GB keyboard), but not the same. Were you able to reproduce the issue this time?

how is the example text keyboard-language related?

I’m not sure either. I was unable to narrow it down to anything specifically.

6

Some keyboard layouts use compositions, i.e. press an accent and then press a vowel to combine them, like French. That might be what’s happening here.

An extreme example is the Vietnamese keyboard where typing “ER” results into ẻ.

7

I’ve got this down to a reproducible case. The combination of a marker decoration and syntax highlighting does it:

Demo

In Safari, with an IME enabled (say, Pinyin or Hiragana), place the cursor inside the parentheses in console.log() and type a character. The cursor jumps back a few characters and composition ends abruptly. ⌥ + n on a US or GB keyboard will do it too.

8

Thanks, that made it easy to reproduce. This patch should help.

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