Fix Ctrl+Backspace bug after Select All in chat search popup

[vchuynh]

Description

fixes #4461

PR fixes Ctrl+Backspace not working properly in chat search popup

• Adds event filter to SearchPopup class. Filters for Ctrl+Backspace and clears text if entire text is selected.

[pajlada]

Do you see anything potentially bad with this change @Mm2PL? I don't think we do hotkeys on inputs other than the split input one so this should be alright

[Mm2PL]

LGTM

[Felanbird]

works on 🅱️ indows

[Mm2PL]

@vchuynh,
Thank you! As a first-time contributor, you can now add yourself to the contributors list that's shown inside the About page in Chatterino.

If you want this, you can open a new PR where you modify the resources/contributors.txt file and add yourself to the list. Make sure to read the comments at the top for instructions.

Please create new branches (from our master) for new PRs. My suggestion would be discarding all commits from your master and replacing it with upstream:

$ git remote add upstream https://github.com/Chatterino/chatterino2
$ git fetch --all
$ git checkout master
$ git reset --hard upstream/master

For new PRs, I just use:

$ # assuming origin is your remote name (which by default it is)
$ git checkout -b <new-branch-name>
$ # ... do the changes ...
$ git push origin <new-branch-name>
$ # ... do more changes ...
$ git push