Always print the mouse cursor, even if coordinates haven't changed.

This makes sure that the cursor is always visible, even if the program
has written text to the screen (only valid for non-P/M mouse callbacks).

libsrc/atari/mou/atrst.s

@@ -170,11 +170,8 @@ INSTALL:
         dex
         bpl     @L1
 
-; Be sure the mouse cursor is invisible and at the default location. We
-; need to do that here, because our mouse interrupt handler doesn't set the
-; mouse position if it hasn't changed.
+; Be sure the mouse cursor is invisible and at the default location.
 
-        sei
         jsr     CHIDE
         lda     XPos
         sta     XPosWrk
@@ -186,7 +183,6 @@ INSTALL:
         ldx     YPos+1
         stx     YPosWrk+1
         jsr     CMOVEY
-        cli
 
 ; Install timer irq routine to poll mouse.
 
@@ -470,22 +466,7 @@ IRQ:
         ldx     #MOUSE_BTN_LEFT
 @L0:    stx     Buttons
 
-; Update coordinates if needed
-
-        lda     XPosWrk
-        cmp     XPos
-        bne     @Update
-        lda     XPosWrk+1
-        cmp     XPos+1
-        bne     @Update
-        lda     YPosWrk
-        cmp     YPos
-        bne     @Update
-        lda     YPosWrk+1
-        cmp     YPos+1
-        beq     @Done
-
-@Update:ldx     visible
+        ldx     visible
         beq     @L1
         jsr     CHIDE