Composer overflow on long input

[luixxiul]

Steps to reproduce

1. Input aaa...

Outcome

What did you expect?

the new composer should not overflow.

What happened instead?

It overflows.

Operating system

No response

Browser information

No response

URL for webapp

localhost

Application version

develop branch

Homeserver

No response

Will you send logs?

No

[luixxiul]

On the right panel:

[justjanne]

The following change seems to resolve the issue for me locally:

diff --git a/res/css/views/rooms/_MessageComposer.scss b/res/css/views/rooms/_MessageComposer.scss
index 5c34f78a8b..8e091b9431 100644
--- a/res/css/views/rooms/_MessageComposer.scss
+++ b/res/css/views/rooms/_MessageComposer.scss
@@ -37,6 +37,7 @@ limitations under the License.
     }
 
     .mx_MessageComposer_row {
+        overflow: hidden;
         grid-area: composer;
     }