Cursor focus in "Add Layer to Legend" dialog should be in search input

[kannes]

Feature description.
When adding items to a legend in a layout, the "Add Layer to Legend" by default has no useful focus for keyboard input.

Please put the focus on the search input, so one can start typing a layer name right away. Alternatively set it to the list, so one can use the cursor keys to browse. I guess the preference is down to individual preference, I would love the former option right now ;)

This is a tiny UX thing but would be great to have.

QGIS 3.10 on Windows, sorry if this is changed already in newer versions or if it is a OS dependant thing.

Thank you!

[kannes]

Same behaviour in a version from ~six weeks ago.

QGIS version	3.13.0-Master	QGIS code revision	af1576a
Compiled against Qt	5.14.2	Running against Qt	5.14.2
Compiled against GDAL/OGR	3.0.4	Running against GDAL/OGR	3.0.4
Compiled against GEOS	3.8.0-CAPI-1.13.1	Running against GEOS	3.8.0-CAPI-1.13.1
Compiled against SQLite	3.31.1	Running against SQLite	3.32.1
PostgreSQL Client Version	12.2	SpatiaLite Version	4.3.0a
QWT Version	6.1.4	QScintilla2 Version	2.11.4
Compiled against PROJ	6.3.1	Running against PROJ	Rel. 6.3.1, February 10th, 2020
OS Version	Arch Linux

[kannes]

You make me want to use Windows nightlies. Thanks @nyalldawson