D05A - CHRXSCL no longer works while in basic SCREEN graphics mode

[gurcei]

Test Environment (required) You can use MEGA65INFO to retrieve this.

• Platform: MEGA65 R3
• Core Commit: release-0.96 (2201bc2)
• ROM Release: (i.e. 920393)

Describe the bug Intro disk 2 had a program "Southern Ring Nebula" that would do the following:

• It uses SCREEN 320,200,3 that bit works ok
• It then does some poking of the x-scaling? In the hope of stretching the screen to be 160x200 resolution

  70 POKE$D05A, 120 : POKE$D05A,60

• Then it draws random pixels in x-range: 0-->160, and r-yange: 0-->200

But on latest core, this stretching of the x-axis does not occur while in the program's graphics mode, so it only draws to the left half of the screen.

However, if you press run-stop+restore to get back to text mode, you will see that the x-axis stretching is still in effect there (i.e. the cursor looks like it's in 40x25 mode, despite it actually being 80x25. You can confirm this by pressing ESC-4 and ESC-8)

[gurcei]

Oh and also to note, the program runs fine in xemu, with the stretching working properly in the graphics mode