This concerns Windows builds.
When you hover over the line numbers of an editor, you can click to select a full line. The mouse cursor should point to the right while over this selection margin to indicate the expected action. It doesn't.
There is a line of code at codeblocks/sdk/wxscintilla/src/scintilla/src/Editor.cxx:5215 that sets the mouse cursor to point right. I have used the debugger and verified this line IS getting called at the right time.
The problem seems to lie inthe way wxWidgets handles the call. If you look at wxWidgets-2.6.2/src/msw/cursor.cpp:313, you can see that the right arrow is not defined as a Windows default. Instead, the cursor is supposed to load from the wxWidgets DLL, as specified in the resource file wxWidgets-2.6.2/include/wx/msw/wx.rc:55.
So why did I mention all this? Well, it seems there is a right-cursor that DOES get shown at one point. If you hover your mouse over the far left pixel of the text area in the Build Log or the Code::Blocks message tab (a couple tabs to the left of the build log on mine), the cursor points to the right. Why does it happen here, and how can we make use of that to make it also point to the right when you're hovered over the selection margin of an editor window?