🐛 Some differences in key: value format are not highlighted

[sskras]

If compare two text files in key: value format, differences on some lines aren't highlighted.
That also remains if I emulate other tool:

• The raw text output from diff:

--- 1.txt       2024-07-31 12:08:29.959299492 +0300
+++ 2.txt       2024-07-31 12:08:56.531841921 +0300
@@ -1,6 +1,6 @@
 boot: order=scsi0;ide2;net0
-cores: 96
+cores: 2
 scsihw: virtio-scsi-single
-smbios1: uuid=50aa1e50-3ad9-45f1-b9d6-28245cdac1c6
+smbios1: uuid=56097496-497e-4c39-abc4-fccbbf693e68
 sockets: 1
-vmgenid: 93d2f111-f51d-40a5-8108-53e1f575e883
+vmgenid: 1d7f5161-973e-4f5d-9d03-fb8f23f77907

• The screenshot of Delta's output:

Differences in line cores: are colorized
Differences in lines smbios1: and vmgenid: are not.

However, if I rename .txt into .conf, the latter differences got some highlight (even if incomplete):