Any utility that assists in the creation of mods, assets, etc, go here. For example: Ultimate Doom Builder, Slade, WadSmoosh, Oblige, etc.
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I did not see a linux package, and when I tried to build the source I found I was missing make and probably more.
I tried proton 8, 9, 10 before my Xmas vaccation, I tried again just now and its working with with proton 10.
UDB also no longer crashes when I type in a textures name, or a lines tag.
That's certainly how I have UDB set up. I can't remember if it was like that "out of the box" or if it was an option that I chose. I do vaguely remember changing some setting related to this a long time ago, but I've been using the same preferences file for years now. So, I can be certain.
I like it to select things that way because it is consistent with other Doom editors that I have used in the past. However, it is different to the model editors that I use and that does sometimes cause a bit of confusion, so I understand what you are saying. I still much prefer UDB to be set up this way though.
This is the default and intended behavior. In most cases there's no point in selecting only one map element - the vast majority of hotkey actions work when the map element is just highlighted. You only need to select one element if you want to perform the action using the toolbar buttons or the menus.
The "additive select without shift" is when you drag a selection box around map elements. By default this clears the old selection. Holding shift will not clear the selection, and the setting in the preferences can make that the default.
I remember getting used to that in DCK even though DEU-sort editors didn't do it, among numerous other things they didn't deu like DCK. I continue to appreciate that Doom Builder does!