fix and amend description of setting BackspaceSendsBS and its impact (#…

…1202)

docs/mintty.1

@@ -1745,7 +1745,13 @@ Note that the repeat rate can be adjusted dynamically by an escape sequence.
 \fBBackarrow sends ^H\fP (BackspaceSendsBS=no)
 By default, mintty sends \fB^?\fP (ASCII DEL) as the keycode for the backspace key.
 If this option is enabled, \fB^H\fP is sent instead.
-This also changes the \fBCtrl+Backspace\fP code from \fB^_\fP to \fB^?\fP.
+This also changes the \fBCtrl+Backspace\fP code from \fB^H8\fP to \fB^?\fP.
+
+\fINote:\fP This setting also causes the tty setting \fBERASE character\fP 
+to be aligned accordingly (see \fIman termios\fP and command \fIstty erase\fP).
+Mind that this may affect certain applications, for example emacs which 
+cannot interpret the explicit Ctrl+h command anymore.
+
 .br
 (Corresponds to the xterm resource \fBbackarrowKey\fP.)
 

wiki/Tips.md

@@ -421,6 +421,13 @@ the application expects other key sequences than mintty sends.
 (While mintty could be changed to send VT100 application keypad codes in 
 that case, the current behaviour is compatible with xterm.)
 
+### Control+H in emacs ###
+
+If you configure the Backarrow key to send a Backspace character rather 
+than the Linux default DEL character (setting `BackspaceSendsBS=yes`), 
+emacs will not be able to recognize an explicit Ctrl+h command anymore.
+It is recommended to leave this setting at its default.
+
 ### Shift+up/down for text selection in emacs ###
 
 The escape sequences for Shift+up/down are mapped to scroll-backward/forward 
@@ -544,6 +551,18 @@ See the manual page for options and details about
 
 See also the [[Keycodes]] wiki page.
 
+### Backarrow key configuration ###
+
+By default, mintty sends `^?` (ASCII DEL) as the keycode for the Backarrow key.
+This is the Linux default (as opposed to sending `^H` which was the 
+default in many Unix environments).
+This can be changed with setting `BackspaceSendsBS=yes`.
+The tty setting `ERASE character` will be aligned accordingly 
+(see `man termios` and command `stty erase`).
+
+Mind that this may affect certain applications, for example emacs which 
+cannot interpret the explicit Control+h command anymore.
+
 ### Windows-style copy/paste key assignments ###
 
 If both settings `CtrlShiftShortcuts` and `CtrlExchangeShift` are enabled,