Fix .clang-format and some whitespace errors

.clang-format: UseTab: ForIndentation -> Never

Update fluid generated files

.clang-format

@@ -1,7 +1,7 @@
 #
 # clang-format control file for the FLTK project.
 #
-# Copyright 2017 by Bill Spitzak and others.
+# Copyright 2017-2020 by Bill Spitzak and others.
 #
 # This library is free software. Distribution and use rights are outlined in
 # the file "COPYING" which should have been included with this file.  If this
@@ -64,7 +64,7 @@ BasedOnStyle:                                   LLVM
 # this annoying bug of clang-format.
 #
 # UseTab:                                       Always
-UseTab:                                         ForIndentation
+UseTab:                                         Never
 
 # Should we extend code lines beyond 80 columns ?
 # Default: 80

fluid/fluid.cxx

@@ -40,7 +40,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
-#include <locale.h>	// setlocale()..
+#include <locale.h>     // setlocale()..
 #include <time.h>   // time(), localtime(), etc.
 
 #include "../src/flstring.h"

fluid/widget_panel.cxx

@@ -317,7 +317,6 @@ ive to the origin at construction time");
           { Fl_Value_Input* o = new Fl_Value_Input(95, 185, 55, 20, "Size:");
             o->tooltip("The size of the slider.");
             o->labelsize(11);
-            o->step(0.010101);
             o->textsize(11);
             o->callback((Fl_Callback*)slider_size_cb);
             o->align(Fl_Align(FL_ALIGN_TOP_LEFT));

fluid/widget_panel.fl

@@ -295,7 +295,7 @@ Use Ctrl-J for newlines.} xywh {95 40 190 20} labelfont 1 labelsize 11 when 1 te
           Fl_Value_Input {} {
             label {Size:}
             callback slider_size_cb
-            tooltip {The size of the slider.} xywh {95 185 55 20} labelsize 11 align 5 step 0.010101 textsize 11
+            tooltip {The size of the slider.} xywh {95 185 55 20} labelsize 11 align 5 textsize 11
           }
           Fl_Value_Input {} {
             label {Minimum:}
@@ -674,7 +674,7 @@ wCallback->do_callback(wCallback, v);} open
       Fl_Button {} {
         label Revert
         callback revert_cb
-        comment {Hidden Revert button}
+        comment {Hidden Revert button} selected
         xywh {90 370 60 20} labelsize 11 hide
       }
       Fl_Button wLiveMode {

src/Fl_File_Chooser2.cxx

@@ -42,7 +42,7 @@
         \endcode
     - If no "*" pattern is provided, then an entry for "All Files (*)" is automatically added.
     - An optional file preview box is provided which can be toggled by programmer or user
-      showing images, or the first 2048 bytes of printable text. 
+      showing images, or the first 2048 bytes of printable text.
     - Preview image loading functions can be registered to provide custom file previews.
     - The favorites button shows up to 100 user-saved favorite directories, the user's home
       directory, and a filesystems item.

src/Fl_Native_File_Chooser_WIN32.cxx

@@ -527,7 +527,7 @@ int Fl_WinAPI_Native_File_Chooser_Driver::showfile() {
           strncpy(pathname, wchartoutf8(dirname), FNFC_MAX_PATH);
           strncat(pathname, "\\",                 FNFC_MAX_PATH);
           strncat(pathname, wchartoutf8(s),       FNFC_MAX_PATH);
-	  pathname[FNFC_MAX_PATH-1] = 0;
+          pathname[FNFC_MAX_PATH-1] = 0;
           add_pathname(pathname);
         }
       }

src/scandir_posix.c

@@ -157,7 +157,7 @@ fl_scandir(const char *dir, struct dirent ***namelist,
     if (errmsg) fl_snprintf(errmsg, errmsg_sz, "%s", strerror(errno));
 
     // XXX: This would be a thread safe alternative to the above, but commented
-    //      out because we can get either GNU or POSIX versions on linux, 
+    //      out because we can get either GNU or POSIX versions on linux,
     //      which AFAICT are incompatible: GNU doesn't guarantee errmsg is used
     //      at all, whereas POSIX /only/ fills buffer. The two calls are not really
     //      compatible but have the same name and different return values.. wtf?

test/file_chooser.cxx

@@ -39,7 +39,7 @@
 #include <FL/Fl_Double_Window.H>
 #include <FL/Fl_Simple_Terminal.H>
 #include <string.h>
-#include <locale.h>	// setlocale()..
+#include <locale.h>     // setlocale()..
 
 #define TERMINAL_HEIGHT 120
 #define TERMINAL_GREEN  "\033[32m"

test/pixmap_browser.cxx

@@ -23,7 +23,7 @@
 #include <FL/Fl_Printer.H>
 #include <string.h>
 #include <errno.h>
-#include <locale.h>	// setlocale()..
+#include <locale.h>     // setlocale()..
 #include <FL/Fl_File_Chooser.H>
 #include <FL/fl_message.H>
 #include <FL/Fl_SVG_File_Surface.H>