i3/ipc: Use workspace id to handle rename event

[michaelPotter]

This fixes an issue where i3 rename events aren't being handled.

When a rename event comes in, the value of data.current.name is the NEW name value. When we search quickshell's internal workspace state, we can't find the workspace since quickshell still has the old name. This updates the rename event handler to find the workspace by id instead.

I've tested under sway and i3.

Side note: I don't really know C or C++, but afiact it looks like i3 is using pointer addresses for workspace ids (see code below) however it looks like quickshell stores them as qint32. They were definitely coming out as 64 bit ints on my system. I had to use toInteger (which returns a qint64) instead of the toInt that is used elsewhere. I'm not sure if there are other repercussions to this, but I thought you should know.

    # src/ipc.c:363 in i3
    ystr("id");
    y(integer, (uintptr_t)con);

[michaelPotter]

Well shoot. This must be what failed; it's upset about that 64 bit number getting converted:

/home/runner/work/quickshell/quickshell/src/x11/i3/ipc/controller.cpp:297:45: error: narrowing conversion from 'qint64' (aka 'long long') to signed type 'qint32' (aka 'int') is implementation-defined [bugprone-narrowing-conversions,cppcoreguidelines-narrowing-conversions,-warnings-as-errors]
2026-05-22T03:51:14.3289648Z   297 |                 auto* workspace = this->findWorkspaceByID(id);

My fix didn't work in i3 without the qint64 though :/ Let me simmer on it. Any advice would be appreciated.