Remove trailing whitespace

docs/doxygen/mainpages/devtips.h

@@ -40,7 +40,7 @@ The file @c "wx/wxprec.h" includes @c "wx/wx.h". Although this incantation may
 seem quirky, it is in fact the end result of a lot of experimentation, and
 several Windows compilers to use precompilation which is largely automatic for
 compilers with necessary support. Currently it is used for Visual C++
-(including embedded Visual C++) and newer versions of GCC. Some compilers 
+(including embedded Visual C++) and newer versions of GCC. Some compilers
 might need extra work from the application developer to set the build
 environment up as necessary for the support.
 
@@ -106,7 +106,7 @@ and this must not be changed.
 On Microsoft Windows, wxWidgets has a different set of makefiles for each
 compiler, because each compiler's @c 'make' tool is slightly different. Popular
 Windows compilers that we cater for, and the corresponding makefile extensions,
-include: Microsoft Visual C++ (.vc) and MinGW/Cygwin (.gcc). Makefiles are 
+include: Microsoft Visual C++ (.vc) and MinGW/Cygwin (.gcc). Makefiles are
 provided for the wxWidgets library itself, samples, demos, and utilities.
 
 On Linux and macOS, you use the @c 'configure' command to generate the

docs/doxygen/mainpages/introduction.h

@@ -94,8 +94,8 @@ primary supported compiler is GNU g++.
 supports 32 or 64 bit Intel Macs running macOS 10.10 or later. The port can be
 built either with g++ or clang.
 
-Other platforms (e.g. iOS - with a minimum requirement of iOS 13), compilers 
-(Sun CC, HP-UX aCC, IBM xlC or SGI mipsPro under Unix) and ports (wxQT, wxGTK1, 
+Other platforms (e.g. iOS - with a minimum requirement of iOS 13), compilers
+(Sun CC, HP-UX aCC, IBM xlC or SGI mipsPro under Unix) and ports (wxQT, wxGTK1,
 wxX11, wxDFB...) are also supported but to a lesser extent.
 Please see the @subpage page_port "platform details page" for more information.
 

docs/doxygen/mainpages/platdetails.h

@@ -96,7 +96,7 @@ and candy of newer interfaces like GTK.
 wxMSW is a port of wxWidgets for the Windows platforms (Windows XP and later
 are supported). wxMSW provides native look and feel for each Windows version.
 This port can be compiled with several compilers including Microsoft Studio
-VC++ 2003 or later, MinGW32, Cygwin as well as cross-compilation with a 
+VC++ 2003 or later, MinGW32, Cygwin as well as cross-compilation with a
 Linux-hosted MinGW32 tool chain.
 
 @subpage plat_msw_install "Build and Install Instructions"

include/wx/filefn.h

@@ -186,7 +186,7 @@ enum wxPosixPermissions
         typedef off_t wxFileOffset;
     #endif
 
-    
+
     #define wxPOSIX_STRUCT(s) struct wxPOSIX_IDENT(s)
 
     #ifdef wxHAS_HUGE_FILES

src/gtk1/artgtk.cpp

@@ -14,4 +14,3 @@
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
-

tests/events/evtsource.cpp

@@ -12,4 +12,3 @@
 // ----------------------------------------------------------------------------
 
 #include "testprec.h"
-