Undo recent commits intended to fix #1427 because fix is only partial.

The branch is at the same state as 4f9d779 after this commit.
Undone commits are: 0fe9b6c, 88a4d74, fe4a6aa, and d2cff61.

src/Fl_cocoa.mm

@@ -2150,11 +2150,10 @@ static void cocoaKeyboardHandler(NSEvent *theEvent)
     NSString *sim = [theEvent charactersIgnoringModifiers];
     UniChar one;
     CFStringGetCharacters((CFStringRef)sim, CFRangeMake(0, 1), &one);
+    // charactersIgnoringModifiers doesn't ignore shift, remove it when it's on
+    if(one >= 'A' && one <= 'Z') one += 32;
     if (one > 0 && one <= 0x7f && (sym<'0' || sym>'9') ) sym = one;
   }
-  // sym may contain an uppercase letter, e.g. with non-latin keyboard layout and ctrl/cmd,
-  // replace uppercase letter by lowercase.
-  if (sym >= 'A' && sym <= 'Z') sym += 32;
   Fl::e_keysym = Fl::e_original_keysym = sym;
   /*NSLog(@"cocoaKeyboardHandler: keycode=%08x keysym=%08x mods=%08x symbol=%@ (%@)",
    keyCode, sym, mods, [theEvent characters], [theEvent charactersIgnoringModifiers]);*/

src/Fl_x.cxx

@@ -1300,7 +1300,6 @@ static bool remove_xid_vector(Window xid) {
   return false;
 }
 
-
 int fl_handle(const XEvent& thisevent)
 {
   XEvent xevent = thisevent;
@@ -1992,19 +1991,6 @@ int fl_handle(const XEvent& thisevent)
       keysym = '0';
     }
 
-    int keysyms_per_keycode;
-    KeySym *syms = XGetKeyboardMapping(fl_display, 38 /* 'A' key on US keyboard */, 1,
-                                        &keysyms_per_keycode);
-    // Check for non-Latin keyboard layout. Based on the assumption that the 'A' key of the keyboard
-    // having a non-ASCII keysym indicates a non-Latin layout.
-    if (syms[0] > 'z') {
-      int asciiSym = Fl_Unix_System_Driver::keycode_to_ascii(keycode);
-      if (asciiSym != 0) {
-        keysym = asciiSym;
-      }
-    }
-    XFree(syms);
-
     // We have to get rid of the XK_KP_function keys, because they are
     // not produced on Windoze and thus case statements tend not to check
     // for them.  There are 15 of these in the range 0xff91 ... 0xff9f

src/drivers/Unix/Fl_Unix_System_Driver.H

@@ -49,7 +49,6 @@ public:
   static unsigned char *create_bmp(const unsigned char *data, int W, int H, int *return_size);
   static Fl_RGB_Image *own_bmp_to_RGB(char *bmp);
   static void read_int(uchar *c, int& i);
-  static char keycode_to_ascii(int keycode);
 };
 
 #endif /* FL_NIX_SYSTEM_DRIVER_H */

src/drivers/Unix/Fl_Unix_System_Driver.cxx

@@ -912,23 +912,3 @@ Fl_RGB_Image *Fl_Unix_System_Driver::own_bmp_to_RGB(char *bmp) {
   img->alloc_array = 1;
   return img;
 }
-
-
-/*
- Used with non-Latin keyboards to get the Latin letter associated to a key,
- typically useful when used with Ctrl.
- Based on the assumption that Latin letters have the QWERTY layout in any
- non-Latin layout. This assumption was verified true for Greek, Russian,
- and Thai layouts.
- Not used with keyboard layouts using Latin letters where the location
- of letters varies extensively (e.g., French, Turkish).
- */
-char Fl_Unix_System_Driver::keycode_to_ascii(int keycode) {
-  static const char row_AD[] = "qwertyuiop";
-  static const char row_AC[] = "asdfghjkl";
-  static const char row_AB[] = "zxcvbnm";
-  if (keycode >= 24 && keycode <= 33) return row_AD[keycode - 24];
-  else if (keycode >= 38 && keycode <= 46) return row_AC[keycode - 38];
-  else if (keycode >= 52 && keycode <= 58) return row_AB[keycode - 52];
-  else return 0;
-}

src/drivers/Wayland/Fl_Wayland_Screen_Driver.cxx

@@ -21,7 +21,7 @@
 #include <wayland-cursor.h>
 #include "../../../libdecor/build/fl_libdecor.h"
 #include "xdg-shell-client-protocol.h"
-#include "../Unix/Fl_Unix_System_Driver.H"
+#include "../Posix/Fl_Posix_System_Driver.H"
 #include <FL/Fl.H>
 #include <FL/Fl_Image_Surface.H>
 #include <FL/platform.H>
@@ -604,14 +604,6 @@ static int process_wld_key(struct xkb_state *xkb_state, uint32_t key,
   } else if (keycode == 19) {
     for_key_vector = '0';
   }
-  // Check for non-Latin keyboard layout. Based on the assumption that the 'A' key of the keyboard
-  // having a non-ASCII keysym indicates a non-Latin layout.
-  if (xkb_state_key_get_one_sym(xkb_state, 38 /* 'A' key on US keyboard */) > 'z') {
-    int asciiSym = Fl_Unix_System_Driver::keycode_to_ascii(keycode);
-    if (asciiSym != 0) {
-      for_key_vector = asciiSym;
-    }
-  }
   if (p_keycode) *p_keycode = keycode;
   if (p_sym) *p_sym = sym;
   return for_key_vector;