The 01 March 2020 build (11973) is out.

[oBFusCATed]

I don't see anything interesting here. Can you show me a screenshot? (I've tested on linux and your config seems to work fine)

[raynebc]

Here's a screen capture:
https://i.imgur.com/vq28ZsJ.png

The first instance of "eof_selection" is selected, but that is not visible due to the background color of selected text.  After going into "Settings>Editor>Syntax highlighting, picking "Selection from the list and changing the background color from "Default" to light gray, it looks like this:
https://i.imgur.com/g3yvUMD.png

Going back to "Syntax Highlighting>Selection" and clicking "Reset defaults" changes the clearly visible shade of gray to one so light it's hardly visible:
https://i.imgur.com/SzO6L4G.png

[oBFusCATed]

Can you try to revert rev 11930 and test again? (it is the commit I've mentioned and it fixes this issue https://sourceforge.net/p/codeblocks/tickets/267/ )

I don't see this. Can someone else on windows try to reproduce this?

[raynebc]

As per our previous communications, I can't build C::B from source:
http://forums.codeblocks.org/index.php/topic,23498.msg160068.html#msg160068

[BlueHazzard]

I don't see this. Can someone else on windows try to reproduce this?

I can not reproduce it normally: i have tried to do Settings->Editor->Syntax highlighting->Reset defaults . After this still all seems to be normal
Hovever i can make the same behaviour by pressing the "D" Button near the "Background" selector for the "Selection" color. So steps to reproduce for me:
1) Open Settings->Editor->Syntax highlighting
2) Select "Selection" from the List
3) Hit the "D" Button for the "Background" color. It resets to "Default" and this seems to be "invisible?"
By pressing the button "Reset defaults" the "Background" color goes back to some gray type.
I have not looked into the code....

[BlueHazzard]

Looking into the code this seems to be the default behavior

Code

void EditorConfigurationDlg::OnSetDefaultColour(wxCommandEvent& event)
{
    wxWindow *button = nullptr;
    if (event.GetId() == XRCID("btnForeSetDefault"))
        button = FindWindowById(XRCID("btnColoursFore"));
    else if (event.GetId() == XRCID("btnBackSetDefault"))
        button = FindWindowById(XRCID("btnColoursBack"));
    if (!button)
        return;
    button->SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_BTNFACE));
    button->SetLabel(_("\"Default\""));
    WriteColours();
}