Here is the debug of the issue in Firefox:

Web Console:

Warning: The range anchor was set to a Node that is not a Text node. This should not happen and can degrade performance. 
The node in question was: Object { _map: {…}, __ownerID: undefined, __cache_key: 0, __cache: Map(0), __cache_no_args: {…} } rageshake.js:66:16

It's the stack trace when i stop the script hanging firefox:

Error: Script terminated by timeout at:
n/e[t]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:16354
remove_node@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:12916
P@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:23294
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:15846
Ge.removeNodeByKey@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:15:7880
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:16193
vt.prototype[e]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:17143
validateNode/</<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:15:15269
Be.prototype.__iterate@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:19:15153
forEach@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:19:27799
validateNode/<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:15:15247
r@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:22270
r@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:22585
M@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:22629
A@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:22160
A@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:22019
pt.normalizeNodeByKey@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:10458
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:16193
vt.prototype[e]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:17143
qe.insertInlineAtRange@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:14:27905
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:16193
vt.prototype[e]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:17143
Be/this.onChange/<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:8482
Be.prototype.__iterate@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:19:15153
forEach@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:19:27799
Be/this.onChange@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:8174
Be/this.setDisplayedCompletion</t<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:18842
o@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:1:14521
e.exports/e.method/<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:42:30793
Be/this.setDisplayedCompletion</<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:18889
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:75:13631
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:75:12883
Be/this.moveAutocompleteSelection@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:17478
t/<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:17267
r@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:88:8224
u/<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:88:9271
s/</e[t]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:88:8400
o@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:1:14521
e.exports/l.prototype._promiseFulfilled@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:42:20365
e.exports/e.coroutine/<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:42:22211
Be/this.onTab</<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:17378
Be/this.onKeyDown@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:161:9736
a/i[t]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:176:24954
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:15:18790
Ge/this.onEvent/<@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:176:24617
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:16:16193
Ge/this.change@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:176:24386
Ge/this.onEvent@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:176:24596
t/</n[e]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:176:22428
value@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:176:19956
t/</n[e]@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:176:18928
r@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:54:10724
a@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:54:6772
s@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:54:6989
p@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:29:17604
h@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:29:17732
n@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:77:22644
processEventQueue@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:29:18810
r@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:171:225
handleTopLevel@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:171:329
i@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:171:757
perform@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:40:25413
batchedUpdates@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:77:14195
i@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:12:11514
dispatchEvent@https://riot.im/app/bundles/1f9498dc730a5bf463e6/bundle.js:171:1622
 memoize.js:59:41

Uh oh!

Hang when typing :smile and trying to iterate through the remaining emojis with <Tab> #7105

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