Repository: godot
Issue: Theme resource with default font changes on every save
Labels: bug,topic:core

### Godot version

3.5.stable.arch_linux

### System information

Linux 5.19.11-arch1-1

### Issue description

I've saved a GUI theme as gui_theme.tres. I'm using `git` for version control. The gui_theme resource has a default font assigned. That part of the resource frequently changes on its own without me deliberately editing the gui theme or the font, which causes spurious changes in version control.

The diff looks like:

```diff
diff --git a/gui_theme.tres b/gui_theme.tres
index f6e7187..ba88da8 100644
--- a/gui_theme.tres
+++ b/gui_theme.tres
@@ -17,7 +17,7 @@ size = Vector2( 128, 256 )
 
 [sub_resource type="BitmapFont" id=4]
 textures = [ SubResource( 3 ) ]
-chars = PoolIntArray( 32, 0, 0, 0, 0, 0, 0, 11, 4, 160, 0, 1734439808, 0, 0, 0, 0, 11, 4, 96, 0, 2, 216, 3, 2, 3, 0, 8, 192, 0, 32, 16, 11, 13, -1, -2, 9, 224, 0, 85, 180, 5, 11, 1, 0, 7, 64, 0, 72, 34, 10, 11, 1, 1, 12, 97, 0, 76, 188, 5, 8, 1, 3, 7, 65, 0, 2, 16, 11, 10, -1, 1, 9, 161, 0, 2, 222, 2, 11, 1, 3, 4, 193, 0, 17, 16, 11, 13, -1, -2, 9, 225, 0, 112, 169, 5, 11, 1, 0, 7, 33, 0, 65, 234, 2, 10, 1, 1, 4, 34, 0, 49, 187, 5, 4, 1, 1, 6, 162, 0, 12, 136, 6, 10, 1, 1, 8, 66, 0, 46, 109, 7, 10, 1, 1, 9, 194, 0, 113, 2, 11, 13, -1, -2, 9, 226, 0, 72, 143, 6, 11, 1, 0, 7, 98, 0, 102, 165, 6, 11, 1, 0, 8, 99, 0, 40, 179, 5, 8, 1, 3, 7, 67, 0, 68, 115, 7, 10, 1, 1, 8, 227, 0, 2, 155, 6, 12, 1, -1, 7, 195, 0, 53, 2, 11, 14, -1, -3, 9, 163, 0, 22, 167, 6, 10, 1, 1, 8, 35, 0, 78, 66, 8, 10, 0, 1, 9, 164, 0, 14, 79, 8, 7, 0, 3, 8, 68, 0, 90, 66, 8, 10, 1, 1, 10, 100, 0, 82, 150, 6, 11, 1, 0, 8, 36, 0, 102, 137, 6, 12, 1, 0, 8, 196, 0, 98, 2, 11, 13, -1, -2, 9, 228, 0, 121, 169, 5, 11, 1, 0, 7, 101, 0, 32, 124, 6, 8, 1, 3, 8, 197, 0, 83, 2, 11, 12, -1, -1, 9, 229, 0, 20, 196, 5, 12, 1, -1, 7, 165, 0, 79, 98, 7, 10, 0, 1, 8, 69, 0, 29, 191, 5, 10, 1, 1, 7, 37, 0, 2, 30, 10, 10, 1, 1, 12, 230, 0, 58, 34, 10, 8, 1, 3, 12, 102, 0, 2, 201, 5, 11, 0, 0, 4, 166, 0, 95, 228, 2, 14, 3, 0, 7, 198, 0, 21, 2, 12, 10, -1, 1, 12, 70, 0, 101, 105, 6, 10, 1, 1, 7, 38, 0, 67, 49, 9, 10, 1, 1, 10, 39, 0, 119, 219, 2, 4, 1, 1, 3, 167, 0, 112, 131, 6, 11, 0, 0, 7, 103, 0, 13, 107, 7, 11, 1, 3, 7, 199, 0, 57, 97, 7, 13, 1, 1, 8, 231, 0, 2, 186, 5, 11, 1, 3, 7, 71, 0, 66, 65, 8, 10, 1, 1, 10, 168, 0, 77, 217, 4, 2, 2, 0, 8, 104, 0, 72, 158, 6, 11, 1, 0, 8, 40, 0, 93, 212, 4, 12, 1, 1, 4, 200, 0, 47, 195, 5, 13, 1, -2, 7, 232, 0, 62, 143, 6, 11, 1, 0, 8, 72, 0, 54, 65, 8, 10, 1, 1, 10, 105, 0, 109, 213, 3, 11, 0, 0, 4, 41, 0, 51, 226, 3, 12, 0, 1, 4, 201, 0, 56, 197, 5, 13, 1, -2, 7, 233, 0, 52, 142, 6, 11, 1, 0, 8, 169, 0, 44, 34, 10, 10, 1, 1, 12, 73, 0, 38, 191, 5, 10, 0, 1, 5, 170, 0, 29, 205, 4, 5, 0, 1, 5, 42, 0, 108, 80, 7, 6, 0, 0, 8, 202, 0, 65, 202, 5, 13, 1, -2, 7, 74, 0, 92, 195, 5, 13, -2, 1, 3, 106, 0, 101, 213, 4, 14, -1, 0, 4, 234, 0, 12, 181, 6, 11, 1, 0, 8, 171, 0, 22, 181, 5, 6, 1, 4, 7, 43, 0, 101, 94, 7, 7, 0, 3, 8, 107, 0, 112, 92, 7, 11, 1, 0, 7, 203, 0, 83, 200, 5, 13, 1, -2, 7, 235, 0, 2, 171, 6, 11, 1, 0, 8, 75, 0, 102, 66, 8, 10, 1, 1, 8, 44, 0, 107, 231, 2, 3, 1, 9, 4, 172, 0, 2, 104, 7, 4, 0, 6, 8, 108, 0, 113, 228, 2, 11, 1, 0, 4, 204, 0, 101, 196, 5, 13, 0, -2, 5, 236, 0, 30, 214, 3, 11, 0, 0, 4, 76, 0, 22, 124, 6, 10, 1, 1, 7, 173, 0, 16, 229, 3, 2, 1, 7, 5, 45, 0, 123, 201, 3, 2, 1, 7, 5, 109, 0, 68, 2, 11, 8, 1, 3, 13, 205, 0, 11, 211, 5, 13, 0, -2, 5, 237, 0, 37, 214, 3, 11, 1, 0, 4, 77, 0, 62, 20, 10, 10, 1, 1, 12, 46, 0, 101, 231, 2, 2, 1, 9, 4, 110, 0, 111, 107, 6, 8, 1, 3, 8, 206, 0, 20, 212, 5, 13, 0, -2, 5, 238, 0, 11, 196, 5, 11, -1, 0, 4, 174, 0, 30, 33, 10, 10, 1, 1, 12, 78, 0, 2, 79, 8, 10, 1, 1, 10, 175, 0, 35, 111, 7, 1, 0, -1, 7, 111, 0, 102, 153, 6, 8, 1, 3, 8, 207, 0, 119, 184, 5, 13, 0, -2, 5, 239, 0, 69, 219, 4, 11, 0, 0, 4, 79, 0, 41, 66, 9, 10, 1, 1, 11, 47, 0, 90, 105, 7, 10, -1, 1, 5, 176, 0, 61, 219, 4, 4, 1, 1, 6, 112, 0, 32, 150, 6, 11, 1, 3, 8, 240, 0, 82, 165, 6, 11, 1, 0, 8, 208, 0, 86, 33, 9, 10, 0, 1, 10, 80, 0, 52, 128, 6, 10, 1, 1, 8, 48, 0, 42, 135, 6, 10, 1, 1, 8, 177, 0, 46, 97, 7, 8, 0, 3, 8, 113, 0, 22, 152, 6, 11, 1, 3, 8, 241, 0, 2, 112, 6, 12, 1, -1, 8, 81, 0, 15, 59, 9, 13, 1, 1, 11, 209, 0, 74, 80, 8, 14, 1, -3, 10, 49, 0, 45, 212, 4, 10, 2, 1, 8, 178, 0, 58, 187, 5, 6, 0, 1, 5, 114, 0, 85, 217, 4, 8, 1, 3, 5, 210, 0, 2, 62, 9, 13, 1, -2, 11, 242, 0, 62, 165, 6, 11, 1, 0, 8, 82, 0, 35, 97, 7, 10, 1, 1, 8, 50, 0, 57, 114, 7, 10, 1, 1, 8, 179, 0, 53, 214, 4, 6, 0, 1, 5, 115, 0, 112, 146, 6, 8, 0, 3, 7, 211, 0, 106, 49, 9, 13, 1, -2, 11, 243, 0, 52, 172, 6, 11, 1, 0, 8, 83, 0, 24, 96, 7, 10, 0, 1, 7, 51, 0, 22, 138, 6, 10, 1, 1, 8, 180, 0, 9, 228, 3, 2, 3, 0, 8, 116, 0, 67, 188, 5, 10, 0, 1, 5, 212, 0, 93, 49, 9, 13, 1, -2, 11, 244, 0, 42, 164, 6, 11, 1, 0, 8, 84, 0, 13, 93, 7, 10, 0, 1, 7, 52, 0, 24, 110, 7, 10, 1, 1, 8, 117, 0, 42, 123, 6, 8, 1, 3, 8, 181, 0, 2, 140, 6, 11, 1, 3, 8, 245, 0, 12, 165, 6, 12, 1, -1, 8, 213, 0, 2, 44, 9, 14, 1, -3, 11, 85, 0, 114, 66, 8, 10, 1, 1, 10, 53, 0, 92, 119, 6, 10, 1, 1, 8, 118, 0, 15, 47, 9, 8, -1, 3, 7, 182, 0, 68, 98, 7, 13, 1, 0, 9, 214, 0, 80, 49, 9, 13, 1, -2, 11, 246, 0, 72, 173, 6, 11, 1, 0, 8, 86, 0, 76, 18, 10, 10, -1, 1, 8, 54, 0, 82, 121, 6, 10, 1, 1, 8, 183, 0, 77, 223, 2, 2, 1, 5, 4, 215, 0, 2, 93, 7, 7, 0, 3, 8, 247, 0, 90, 94, 7, 7, 0, 3, 8, 119, 0, 37, 2, 12, 8, -1, 3, 10, 87, 0, 2, 2, 15, 10, -1, 1, 13, 55, 0, 72, 129, 6, 10, 1, 1, 8, 184, 0, 116, 212, 3, 3, 0, 11, 3, 120, 0, 119, 80, 7, 8, 0, 3, 7, 248, 0, 2, 128, 6, 8, 1, 3, 8, 216, 0, 99, 33, 9, 12, 1, 0, 11, 88, 0, 90, 19, 10, 10, -1, 1, 8, 56, 0, 62, 129, 6, 10, 1, 1, 8, 185, 0, 23, 229, 3, 6, 0, 1, 5, 57, 0, 12, 122, 6, 10, 1, 1, 8, 121, 0, 112, 33, 9, 11, -1, 3, 7, 249, 0, 52, 157, 6, 11, 1, 0, 8, 217, 0, 38, 80, 8, 13, 1, -2, 10, 89, 0, 28, 65, 9, 10, -1, 1, 7, 186, 0, 37, 205, 4, 5, 0, 1, 5, 58, 0, 89, 229, 2, 8, 1, 3, 4, 122, 0, 112, 119, 6, 8, 1, 3, 7, 90, 0, 32, 136, 6, 10, 1, 1, 8, 250, 0, 42, 149, 6, 11, 1, 0, 8, 218, 0, 26, 79, 8, 13, 1, -2, 10, 187, 0, 31, 181, 5, 6, 1, 4, 7, 59, 0, 71, 234, 2, 9, 1, 3, 4, 251, 0, 12, 150, 6, 11, 1, 0, 8, 123, 0, 103, 180, 5, 12, 0, 1, 5, 91, 0, 58, 227, 3, 12, 1, 1, 4, 219, 0, 50, 80, 8, 13, 1, -2, 10, 60, 0, 92, 153, 6, 7, 1, 3, 8, 92, 0, 97, 80, 7, 10, -1, 1, 5, 252, 0, 92, 133, 6, 11, 1, 0, 8, 220, 0, 62, 79, 8, 13, 1, -2, 10, 124, 0, 83, 229, 2, 14, 3, 0, 7, 188, 0, 16, 33, 10, 10, 0, 1, 10, 61, 0, 79, 112, 7, 5, 0, 4, 8, 125, 0, 110, 196, 5, 12, 0, 1, 5, 93, 0, 44, 226, 3, 12, 0, 1, 4, 221, 0, 54, 48, 9, 13, -1, -2, 7, 253, 0, 28, 47, 9, 14, -1, 0, 7, 189, 0, 47, 20, 11, 10, 0, 1, 10, 126, 0, 62, 158, 6, 3, 1, 5, 8, 94, 0, 86, 80, 7, 6, 0, 1, 7, 62, 0, 112, 158, 6, 7, 1, 3, 8, 254, 0, 102, 119, 6, 14, 1, 0, 8, 222, 0, 32, 165, 6, 10, 1, 1, 8, 190, 0, 104, 19, 10, 10, 0, 1, 10, 95, 0, 92, 148, 6, 1, 0, 12, 6, 63, 0, 74, 202, 5, 10, 0, 1, 6, 191, 0, 94, 180, 5, 11, 0, 3, 6, 255, 0, 41, 48, 9, 14, -1, 0, 7, 223, 0, 82, 135, 6, 11, 1, 0, 8 )
+chars = PoolIntArray( 64, 0, 72, 34, 10, 11, 1, 1, 12, 224, 0, 85, 180, 5, 11, 1, 0, 7, 192, 0, 32, 16, 11, 13, -1, -2, 9, 96, 0, 2, 216, 3, 2, 3, 0, 8, 160, 0, 1734439808, 0, 0, 0, 0, 11, 4, 32, 0, 0, 0, 0, 0, 0, 11, 4, 33, 0, 65, 234, 2, 10, 1, 1, 4, 225, 0, 112, 169, 5, 11, 1, 0, 7, 193, 0, 17, 16, 11, 13, -1, -2, 9, 161, 0, 2, 222, 2, 11, 1, 3, 4, 65, 0, 2, 16, 11, 10, -1, 1, 9, 97, 0, 76, 188, 5, 8, 1, 3, 7, 98, 0, 102, 165, 6, 11, 1, 0, 8, 226, 0, 72, 143, 6, 11, 1, 0, 7, 194, 0, 113, 2, 11, 13, -1, -2, 9, 66, 0, 46, 109, 7, 10, 1, 1, 9, 162, 0, 12, 136, 6, 10, 1, 1, 8, 34, 0, 49, 187, 5, 4, 1, 1, 6, 35, 0, 78, 66, 8, 10, 0, 1, 9, 163, 0, 22, 167, 6, 10, 1, 1, 8, 195, 0, 53, 2, 11, 14, -1, -3, 9, 227, 0, 2, 155, 6, 12, 1, -1, 7, 67, 0, 68, 115, 7, 10, 1, 1, 8, 99, 0, 40, 179, 5, 8, 1, 3, 7, 228, 0, 121, 169, 5, 11, 1, 0, 7, 196, 0, 98, 2, 11, 13, -1, -2, 9, 36, 0, 102, 137, 6, 12, 1, 0, 8, 100, 0, 82, 150, 6, 11, 1, 0, 8, 68, 0, 90, 66, 8, 10, 1, 1, 10, 164, 0, 14, 79, 8, 7, 0, 3, 8, 37, 0, 2, 30, 10, 10, 1, 1, 12, 69, 0, 29, 191, 5, 10, 1, 1, 7, 165, 0, 79, 98, 7, 10, 0, 1, 8, 229, 0, 20, 196, 5, 12, 1, -1, 7, 197, 0, 83, 2, 11, 12, -1, -1, 9, 101, 0, 32, 124, 6, 8, 1, 3, 8, 38, 0, 67, 49, 9, 10, 1, 1, 10, 70, 0, 101, 105, 6, 10, 1, 1, 7, 198, 0, 21, 2, 12, 10, -1, 1, 12, 166, 0, 95, 228, 2, 14, 3, 0, 7, 102, 0, 2, 201, 5, 11, 0, 0, 4, 230, 0, 58, 34, 10, 8, 1, 3, 12, 71, 0, 66, 65, 8, 10, 1, 1, 10, 231, 0, 2, 186, 5, 11, 1, 3, 7, 199, 0, 57, 97, 7, 13, 1, 1, 8, 103, 0, 13, 107, 7, 11, 1, 3, 7, 167, 0, 112, 131, 6, 11, 0, 0, 7, 39, 0, 119, 219, 2, 4, 1, 1, 3, 72, 0, 54, 65, 8, 10, 1, 1, 10, 232, 0, 62, 143, 6, 11, 1, 0, 8, 200, 0, 47, 195, 5, 13, 1, -2, 7, 40, 0, 93, 212, 4, 12, 1, 1, 4, 104, 0, 72, 158, 6, 11, 1, 0, 8, 168, 0, 77, 217, 4, 2, 2, 0, 8, 73, 0, 38, 191, 5, 10, 0, 1, 5, 169, 0, 44, 34, 10, 10, 1, 1, 12, 233, 0, 52, 142, 6, 11, 1, 0, 8, 201, 0, 56, 197, 5, 13, 1, -2, 7, 41, 0, 51, 226, 3, 12, 0, 1, 4, 105, 0, 109, 213, 3, 11, 0, 0, 4, 106, 0, 101, 213, 4, 14, -1, 0, 4, 74, 0, 92, 195, 5, 13, -2, 1, 3, 202, 0, 65, 202, 5, 13, 1, -2, 7, 42, 0, 108, 80, 7, 6, 0, 0, 8, 170, 0, 29, 205, 4, 5, 0, 1, 5, 234, 0, 12, 181, 6, 11, 1, 0, 8, 171, 0, 22, 181, 5, 6, 1, 4, 7, 43, 0, 101, 94, 7, 7, 0, 3, 8, 107, 0, 112, 92, 7, 11, 1, 0, 7, 203, 0, 83, 200, 5, 13, 1, -2, 7, 235, 0, 2, 171, 6, 11, 1, 0, 8, 75, 0, 102, 66, 8, 10, 1, 1, 8, 44, 0, 107, 231, 2, 3, 1, 9, 4, 172, 0, 2, 104, 7, 4, 0, 6, 8, 108, 0, 113, 228, 2, 11, 1, 0, 4, 204, 0, 101, 196, 5, 13, 0, -2, 5, 236, 0, 30, 214, 3, 11, 0, 0, 4, 76, 0, 22, 124, 6, 10, 1, 1, 7, 173, 0, 16, 229, 3, 2, 1, 7, 5, 45, 0, 123, 201, 3, 2, 1, 7, 5, 109, 0, 68, 2, 11, 8, 1, 3, 13, 205, 0, 11, 211, 5, 13, 0, -2, 5, 237, 0, 37, 214, 3, 11, 1, 0, 4, 77, 0, 62, 20, 10, 10, 1, 1, 12, 46, 0, 101, 231, 2, 2, 1, 9, 4, 110, 0, 111, 107, 6, 8, 1, 3, 8, 206, 0, 20, 212, 5, 13, 0, -2, 5, 238, 0, 11, 196, 5, 11, -1, 0, 4, 174, 0, 30, 33, 10, 10, 1, 1, 12, 78, 0, 2, 79, 8, 10, 1, 1, 10, 175, 0, 35, 111, 7, 1, 0, -1, 7, 111, 0, 102, 153, 6, 8, 1, 3, 8, 207, 0, 119, 184, 5, 13, 0, -2, 5, 239, 0, 69, 219, 4, 11, 0, 0, 4, 79, 0, 41, 66, 9, 10, 1, 1, 11, 47, 0, 90, 105, 7, 10, -1, 1, 5, 176, 0, 61, 219, 4, 4, 1, 1, 6, 112, 0, 32, 150, 6, 11, 1, 3, 8, 240, 0, 82, 165, 6, 11, 1, 0, 8, 208, 0, 86, 33, 9, 10, 0, 1, 10, 80, 0, 52, 128, 6, 10, 1, 1, 8, 48, 0, 42, 135, 6, 10, 1, 1, 8, 177, 0, 46, 97, 7, 8, 0, 3, 8, 113, 0, 22, 152, 6, 11, 1, 3, 8, 241, 0, 2, 112, 6, 12, 1, -1, 8, 81, 0, 15, 59, 9, 13, 1, 1, 11, 209, 0, 74, 80, 8, 14, 1, -3, 10, 49, 0, 45, 212, 4, 10, 2, 1, 8, 178, 0, 58, 187, 5, 6, 0, 1, 5, 114, 0, 85, 217, 4, 8, 1, 3, 5, 210, 0, 2, 62, 9, 13, 1, -2, 11, 242, 0, 62, 165, 6, 11, 1, 0, 8, 82, 0, 35, 97, 7, 10, 1, 1, 8, 50, 0, 57, 114, 7, 10, 1, 1, 8, 179, 0, 53, 214, 4, 6, 0, 1, 5, 115, 0, 112, 146, 6, 8, 0, 3, 7, 211, 0, 106, 49, 9, 13, 1, -2, 11, 243, 0, 52, 172, 6, 11, 1, 0, 8, 83, 0, 24, 96, 7, 10, 0, 1, 7, 51, 0, 22, 138, 6, 10, 1, 1, 8, 180, 0, 9, 228, 3, 2, 3, 0, 8, 116, 0, 67, 188, 5, 10, 0, 1, 5, 212, 0, 93, 49, 9, 13, 1, -2, 11, 244, 0, 42, 164, 6, 11, 1, 0, 8, 84, 0, 13, 93, 7, 10, 0, 1, 7, 52, 0, 24, 110, 7, 10, 1, 1, 8, 53, 0, 92, 119, 6, 10, 1, 1, 8, 85, 0, 114, 66, 8, 10, 1, 1, 10, 213, 0, 2, 44, 9, 14, 1, -3, 11, 117, 0, 42, 123, 6, 8, 1, 3, 8, 181, 0, 2, 140, 6, 11, 1, 3, 8, 245, 0, 12, 165, 6, 12, 1, -1, 8, 54, 0, 82, 121, 6, 10, 1, 1, 8, 86, 0, 76, 18, 10, 10, -1, 1, 8, 246, 0, 72, 173, 6, 11, 1, 0, 8, 214, 0, 80, 49, 9, 13, 1, -2, 11, 182, 0, 68, 98, 7, 13, 1, 0, 9, 118, 0, 15, 47, 9, 8, -1, 3, 7, 55, 0, 72, 129, 6, 10, 1, 1, 8, 87, 0, 2, 2, 15, 10, -1, 1, 13, 119, 0, 37, 2, 12, 8, -1, 3, 10, 247, 0, 90, 94, 7, 7, 0, 3, 8, 215, 0, 2, 93, 7, 7, 0, 3, 8, 183, 0, 77, 223, 2, 2, 1, 5, 4, 56, 0, 62, 129, 6, 10, 1, 1, 8, 88, 0, 90, 19, 10, 10, -1, 1, 8, 216, 0, 99, 33, 9, 12, 1, 0, 11, 248, 0, 2, 128, 6, 8, 1, 3, 8, 120, 0, 119, 80, 7, 8, 0, 3, 7, 184, 0, 116, 212, 3, 3, 0, 11, 3, 89, 0, 28, 65, 9, 10, -1, 1, 7, 217, 0, 38, 80, 8, 13, 1, -2, 10, 249, 0, 52, 157, 6, 11, 1, 0, 8, 121, 0, 112, 33, 9, 11, -1, 3, 7, 57, 0, 12, 122, 6, 10, 1, 1, 8, 185, 0, 23, 229, 3, 6, 0, 1, 5, 218, 0, 26, 79, 8, 13, 1, -2, 10, 250, 0, 42, 149, 6, 11, 1, 0, 8, 90, 0, 32, 136, 6, 10, 1, 1, 8, 122, 0, 112, 119, 6, 8, 1, 3, 7, 58, 0, 89, 229, 2, 8, 1, 3, 4, 186, 0, 37, 205, 4, 5, 0, 1, 5, 219, 0, 50, 80, 8, 13, 1, -2, 10, 91, 0, 58, 227, 3, 12, 1, 1, 4, 123, 0, 103, 180, 5, 12, 0, 1, 5, 251, 0, 12, 150, 6, 11, 1, 0, 8, 59, 0, 71, 234, 2, 9, 1, 3, 4, 187, 0, 31, 181, 5, 6, 1, 4, 7, 188, 0, 16, 33, 10, 10, 0, 1, 10, 124, 0, 83, 229, 2, 14, 3, 0, 7, 220, 0, 62, 79, 8, 13, 1, -2, 10, 252, 0, 92, 133, 6, 11, 1, 0, 8, 92, 0, 97, 80, 7, 10, -1, 1, 5, 60, 0, 92, 153, 6, 7, 1, 3, 8, 189, 0, 47, 20, 11, 10, 0, 1, 10, 253, 0, 28, 47, 9, 14, -1, 0, 7, 221, 0, 54, 48, 9, 13, -1, -2, 7, 93, 0, 44, 226, 3, 12, 0, 1, 4, 125, 0, 110, 196, 5, 12, 0, 1, 5, 61, 0, 79, 112, 7, 5, 0, 4, 8, 190, 0, 104, 19, 10, 10, 0, 1, 10, 222, 0, 32, 165, 6, 10, 1, 1, 8, 254, 0, 102, 119, 6, 14, 1, 0, 8, 62, 0, 112, 158, 6, 7, 1, 3, 8, 94, 0, 86, 80, 7, 6, 0, 1, 7, 126, 0, 62, 158, 6, 3, 1, 5, 8, 223, 0, 82, 135, 6, 11, 1, 0, 8, 255, 0, 41, 48, 9, 14, -1, 0, 7, 191, 0, 94, 180, 5, 11, 0, 3, 6, 63, 0, 74, 202, 5, 10, 0, 1, 6, 95, 0, 92, 148, 6, 1, 0, 12, 6 )
```

It just flips between those two PoolByteArray values every time I save.

### Steps to reproduce

1. Create a new project
2. Add a GUI theme resource
3. Add a font
4. Assign the font as a default font in the theme
5. Create a `Control`
6. Assign the GUI theme to the control
7. Save the scene, exit the editor
8. Commit all files to version control
9. Open the editor and scene again
10. Save the scene (without changing anything)
11. Note that the theme resource has changed

### Minimal reproduction project

[example.zip](https://github.com/godotengine/godot/files/9896369/example.zip)