Korean typing is ignored by Text Watcher

[kwo2002]

When I typing korean in the IE 11, textwatcher check function selectionRange collapsed is false.

So, mention (mention plugin using textwatcher) plugin text search not working.

I was added below code, and then mention(textwatcher) is working.

Steps to reproduce

1. Open mentions manual test e.g. tests/plugins/mentions/manual/mentions
2. Change OS language to Korean.
3. Update mentions data feed with Korean words.
4. Start typing in Korean to trigger autocompletion.

Expected

Words are autocompleted.

Actual

Nothing happens.

check: function( evt ) {
            if ( this.ignoreNext ) {
                this.ignoreNext = false;
                return;
            }

            // Ignore control keys, so they don't trigger the check.
            if ( evt && evt.name == 'keyup' && ( CKEDITOR.tools.array.indexOf( this.ignoredKeys, evt.data.getKey() ) != -1 ) ) {
                return;
            }

            var sel = this.editor.getSelection();
            if ( !sel ) {
                return;
            }

            var selectionRange = sel.getRanges()[ 0 ];

            // I was add this line.
            selectionRange.collapse();

            if ( !selectionRange ) {
                return;
            }
            this._buffer.input( selectionRange );
        },

Other

CKEditor version: 4.10.0 Browser: IE11

[jacekbogdanski]

It looks like Korean letters are preselected on IE11, so textwatcher always fails on attached code listing.

I updated your issue description to make it a bit more readable.

[f1ames]

@kwo2002 Is the PR you proposed (https://github.com/ckeditor/ckeditor-dev/pull/3070) aimed to fix this issue?

[kwo2002]

@kwo2002 Is the PR you proposed (#3070) aimed to fix this issue?

Yes