Fix setCursorPos and setCursorXPos on POSIX (#8310)

changelog.md

@@ -54,6 +54,11 @@
 - The procs ``parseHexInt`` and ``parseOctInt`` now fail on empty strings
     and strings containing only valid prefixes, e.g. "0x" for hex integers.
 
+- ``terminal.setCursorPos`` and ``terminal.setCursorXPos`` now work correctly
+  with 0-based coordinates on POSIX (previously, you needed to use
+  1-based coordinates on POSIX for correct behaviour; the Windows behaviour
+  was always correct).
+
 
 #### Breaking changes in the compiler
 

lib/pure/terminal.nim

@@ -308,7 +308,7 @@ proc setCursorPos*(f: File, x, y: int) =
     let h = conHandle(f)
     setCursorPos(h, x, y)
   else:
-    f.write(fmt"{stylePrefix}{y};{x}f")
+    f.write(fmt"{stylePrefix}{y+1};{x+1}f")
 
 proc setCursorXPos*(f: File, x: int) =
   ## Sets the terminal's cursor to the x position.
@@ -323,7 +323,7 @@ proc setCursorXPos*(f: File, x: int) =
     if setConsoleCursorPosition(h, origin) == 0:
       raiseOSError(osLastError())
   else:
-    f.write(fmt"{stylePrefix}{x}G")
+    f.write(fmt"{stylePrefix}{x+1}G")
 
 when defined(windows):
   proc setCursorYPos*(f: File, y: int) =