[Webkit-unassigned] [Bug 191182] New: [GTK] Text offset calculation breaks with certain emojicons

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191182

            Bug ID: 191182
           Summary: [GTK] Text offset calculation breaks with certain
                    emojicons
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcrha at redhat.com
                CC: bugs-noreply at webkitgtk.org

Moving this from a downstream bug report:
https://gitlab.gnome.org/GNOME/evolution/issues/206

It contains more details, I'll summarize it here:

Evolution uses webkit_dom_range_get_end_offset() and webkit_dom_character_data_delete_data() with other offset-related WebKitDOMCharacterData functions to replace emoticons written by a user to either images or Unicode letters or "normalized appearance" (like from ":)" to ":-)"). Just have in Edit->Preferences->Composer Preferences checked [x] Automatically insert emoticons and [x] Use Unicode characters for emoticons, then create a new message in Plain Text mode and type:

 :) ;) :)

The first two will be replaced, but the third not ("☺ 😉 :)"). 

I figured out that the webkit_dom_range_get_end_offset() returns wrong value when the text contains a wink Unicode letter, it says that the end is one letter after the text (character) length. When I workaround it and clamp it, then the replacement of the typed ":)" at the end is made also off-by-one, thus it makes it "☺ 😉)☺" instead of "☺ 😉 ☺", which makes me believe the WebKitDOMCharacterData functions are affected the same way.

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