Docklike incorrectly maps windows to .desktop files (maps Sublime Text to Sublime Merge, VSCode to VSCode URL handler)

I currently have Sublime Text and Merge installed on Arch Linux, through the AUR packages. These create .desktop files at /usr/share/applications/sublime_text.desktop and /usr/share/applications/sublime_merge.desktop.

On docklike git 588998ad, when I open a Sublime Text window through subl or the .desktop file (which launches subl), if I have Sublime Merge installed, then docklike instead shows the Sublime Merge app icon. And pinning the .desktop file pins /usr/share/applications/sublime_merge.desktop to ~/.config/xfce4/panel/docklike-1.rc, instead of /usr/share/applications/sublime_text.desktop. Similarly, right-clicking Sublime Text and selecting Edit Launcher instead edits Sublime Merge's launcher.

I think this bug (the icon part, not sure about the pinning part) occurs because GroupWindow::GroupWindow(WnckWindow* wnckWindow) first calls std::string groupName = Wnck::getGroupName(this); (which returns "subl"), then AppInfo* appInfo = AppInfos::search(groupName); which does a fuzzy g_desktop_app_info_search for "subl", then picks the first result. And Sublime Merge comes alphabetically before Sublime Text.

I'm currently unsure how to handle docking more robustly. xfce4-panel's official windowmenu plugin (source) and xfwm4 pick the proper window icon for Sublime Text windows, but I didn't look into what algorithm they use for finding icons or .desktop files. KWin and plasmashell also handle icons correctly, and plasmashell comes with a built-in dock (source) supporting app clustering, which is robust in my experience, but I didn't look into how it works either.

And pinning VS Code seems to pin /usr/share/applications/visual-studio-code-url-handler.desktop instead (most or all of the time). I'm not sure exactly what I did (possibly some order of opening VS Code from Whisker Menu, the dock, or terminal code, and possibly restarting xfce4-panel), but at one point I pinned visual-studio-code-url-handler.desktop, but Docklike "assigned" the VS Code windows I had open to visual-studio-code.desktop, and clicking the pinned icon opened VS Code windows under another dock icon. And right now, if I manually edit ~/.config/xfce4/panel/docklike-1.rc to say visual-studio-code.desktop, then my open VS Code windows are instead grouped into a different icon under visual-studio-code-url-handler.desktop.

Similarly, docklike occasionally starts mapping Sublime Text windows to the real Sublime Text .desktop file rather than Sublime Merge, but I haven't figured out what causes it. I've tried and failed to trigger this by launching unrecognized apps without .desktop files, or by installing apps using sudo pacman -S kate (or -R to uninstall).

(Also thanks for the code quality, debugging docklike is almost therapeutic compared to the other codebases I've looked at recently.)

(accidentally created an issue on my fork at https://gitlab.xfce.org/nyanpasu64/xfce4-docklike-plugin/-/issues/1, moving it here)